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Готові списки джерел за темами / Ionospheric radio wave propagation / Статті в журналах

Щоб переглянути інші типи публікацій з цієї теми, перейдіть за посиланням: Ionospheric radio wave propagation.

Статті в журналах з теми "Ionospheric radio wave propagation"

Автор: Grafiati

Опубліковано: 4 червня 2021

Оновлено: 29 липня 2024

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1

Li, Qingfeng, Zeyun Li, and Hanxian Fang. "Using 3D Ray Tracing Technology to Study the Disturbance Effect of Rocket Plume on Ionosphere." Atmosphere 13, no. 7 (July 20, 2022): 1150. http://dx.doi.org/10.3390/atmos13071150.

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In this paper, the initial neutral atmospheric parameters, background ionospheric parameters and geomagnetic field parameters of the ionosphere are obtained by NRLMSISE-00 model, IRI-2016 model and IGRF-13 model, respectively. Considering the neutral gas diffusion process, ion chemical reaction and plasma diffusion process, a three-dimensional dynamic model of chemical substances released by rocket plume disturbing the ionosphere is constructed. The influence of the disturbance on the echo path of high frequency radio waves with different incident frequencies is simulated by using three-dimens

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2

Krasheninnikov, I. V., and V. N. Shubin. "Features of Forecasting the Operation of Ionospheric Radio Lines in Upper Rays Modes." Геомагнетизм и аэрономия 63, no. 4 (July 1, 2023): 473–80. http://dx.doi.org/10.31857/s0016794023600096.

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The frequency dependence of transmitted information qualitative indicators is analyzed on theexample of two meridional radio links: single-hop (~2600 km) and dominant two-hop (~5100 km) for basicmodes of radio wave propagation in the ionosphere. It is shown that the presence of highly efficient receivingtransmittingantennas in a radio communication system leads to the need to take the existence of a priori energeticallyextremely weak modes into account in the problem of radio path specification statement. In thiscase, we consider those formed exclusively by the mechanism of radiation transfer

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3

Yang, Li-Xia, Chao Liu, Qing-Liang Li, and Yu-Bo Yan. "Electromagnetic wave propagation characteristics of oblique incidence nonlinear ionospheric Langmuir disturbance." Acta Physica Sinica 71, no. 6 (2022): 064101. http://dx.doi.org/10.7498/aps.71.20211204.

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Based on the generalized Zakharov model, a numerical model of electromagnetic wave propagating in the ionosphere at different angles is established by combining the finite difference time domain (FDTD) method of obliquely incident plasma with the double hydrodynamics equation and through equivalently transforming the two-dimensional Maxwell equation into one-dimensional Maxwell equation and the plasma hydrodynamics equation. In this paper. the dominant equation of Z-wave in obliquely incident nonlinear ionospheric plasma having been analyzed and deduced, the FDTD algorithm suitable for calcula

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4

LaBelle, J. "High-latitude propagation studies using a meridional chain of LF/MF/HF receivers." Annales Geophysicae 22, no. 5 (April 8, 2004): 1705–18. http://dx.doi.org/10.5194/angeo-22-1705-2004.

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Abstract. For over a decade, Dartmouth College has operated programmable radio receivers at multiple high-latitude sites covering the frequency range 100-5000kHz with about a 1-s resolution. Besides detecting radio emissions of auroral origin, these receivers record characteristics of the ionospheric propagation of natural and man-made signals, documenting well-known effects, such as the diurnal variation in the propagation characteristics of short and long waves, and also revealing more subtle effects. For example, at auroral zone sites in equinoctial conditions, the amplitudes of distant tra

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5

Pavelyev, A. G., Y. A. Liou, K. Zhang, C. S. Wang, J. Wickert, T. Schmidt, V. N. Gubenko, A. A. Pavelyev, and Y. Kuleshov. "Identification and localization of layers in the ionosphere using the eikonal and amplitude of radio occultation signals." Atmospheric Measurement Techniques 5, no. 1 (January 4, 2012): 1–16. http://dx.doi.org/10.5194/amt-5-1-2012.

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Abstract. By using the CHAllenge Minisatellite Payload (CHAMP) radio occultation (RO) data, a description of different types of the ionospheric impacts on the RO signals at the altitudes 30–90 km of the RO ray perigee is given and compared with the results of measurements obtained earlier in the satellite-to-Earth communication link at frequency 1.5415 GHz. An analytical model is introduced for describing propagation of radio waves in a stratified medium consisting of sectors with spherically symmetric refractivity distribution. This model gives analytical expressions for the phase, bending an

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6

Leyser, Thomas B., H. Gordon James, Björn Gustavsson, and Michael T. Rietveld. "Evidence of <i>L</i>-mode electromagnetic wave pumping of ionospheric plasma near geomagnetic zenith." Annales Geophysicae 36, no. 1 (February 21, 2018): 243–51. http://dx.doi.org/10.5194/angeo-36-243-2018.

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Abstract. The response of ionospheric plasma to pumping by powerful HF (high frequency) electromagnetic waves transmitted from the ground into the ionosphere is the strongest in the direction of geomagnetic zenith. We present experimental results from transmitting a left-handed circularly polarized HF beam from the EISCAT (European Incoherent SCATter association) Heating facility in magnetic zenith. The CASSIOPE (CAScade, Smallsat and IOnospheric Polar Explorer) spacecraft in the topside ionosphere above the F-region density peak detected transionospheric pump radiation, although the pump freq

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7

Danskin, D. W., A. V. Koustov, T. Ogawa, N. Nishitani, S. Nozawa, S. E. Milan, M. Lester, and D. Andre. "On the factors controlling occurrence of F-region coherent echoes." Annales Geophysicae 20, no. 9 (September 30, 2002): 1385–97. http://dx.doi.org/10.5194/angeo-20-1385-2002.

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Abstract. Several factors are known to control the HF echo occurrence rate, including electron density distribution in the ionosphere (affecting the propagation path of the radar wave), D-region radio wave absorption, and ionospheric irregularity intensity. In this study, we consider 4 days of CUTLASS Finland radar observations over an area where the EISCAT incoherent scatter radar has continuously monitored ionospheric parameters. We illustrate that for the event under consideration, the D-region absorption was not the major factor affecting the echo appearance. We show that the electron dens

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8

Mabie, Justin, and Terence Bullett. "Multiple Cusp Signatures in Ionograms Associated with Rocket-Induced Infrasonic Waves." Atmosphere 13, no. 6 (June 12, 2022): 958. http://dx.doi.org/10.3390/atmos13060958.

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We are interested in understanding how and when infrasonic waves propagate in the thermosphere, specifying the physical properties of those waves, and understanding how they affect radio wave propagation. We use a combination of traditional ionosonde observations and fixed frequency Doppler soundings to make high quality observations of vertically propagating infrasonic waves in the lower thermosphere/bottom side ionosphere. The presented results are the first simultaneous observations of infrasonic wave-induced deformations in ionograms and high-time-resolution observations of corresponding p

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9

Riabova, S. A., E. V. Olshanskaya, and S. L. Shalimov. "Response of the Lower and Upper Ionosphere to Earthquakes in Turkey on February 6, 2023." Физика земли 2023, no. 6 (November 1, 2023): 153–62. http://dx.doi.org/10.31857/s0002333723060182.

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Abstract—Ground-based magnetometers and ionospheric radio probing by means of GPS were used to analyze and interpret specific variations of the geomagnetic field and the total electron content of the ionosphere during strong catastrophic earthquakes in Turkey on February 6, 2023. It is shown that the ionospheric responses to these earthquakes recorded at distances of 1200–1600 km from the epicentre in the lower ionosphere and at distances of up to 500 km from the epicentre in the upper ionosphere can be interpreted in terms of the propagation of the Rayleigh seismic wave and atmospheric waves

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10

Waters, C. L., T. K. Yeoman, M. D. Sciffer, P. Ponomarenko, and D. M. Wright. "Modulation of radio frequency signals by ULF waves." Annales Geophysicae 25, no. 5 (June 4, 2007): 1113–24. http://dx.doi.org/10.5194/angeo-25-1113-2007.

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Abstract. The ionospheric plasma is continually perturbed by ultra-low frequency (ULF; 1–100 mHz) plasma waves that are incident from the magnetosphere. In this paper we present a combined experimental and modeling study of the variation in radio frequency of signals propagating in the ionosphere due to the interaction of ULF wave energy with the ionospheric plasma. Modeling the interaction shows that the magnitude of the ULF wave electric field, e, and the geomagnetic field, B0, giving an e×B0 drift, is the dominant mechanism for changing the radio frequency. We also show how data from high f

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11

Kouris, S. S., P. A. Bradley, and P. Dominici. "<i>Letter to the Editor:</i> Solar-cycle variation of the daily <i>fo</i>F2 and M(3000)F2." Annales Geophysicae 16, no. 8 (August 31, 1998): 1039–42. http://dx.doi.org/10.1007/s00585-998-1039-0.

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Abstract. Daily values of the ionospheric characteristics foF2 and M(3000)F2 for a given hour and month are correlated with the corresponding daily values of sunspot number using measured data collected at seven European locations. The significance of applying different-order polynomials is considered and the times are confirmed when the higher-order terms are important. Mean correlation coefficients for combined data sets over all hours, months and stations are determined, together with the standard errors of estimates. Comparisons are made with corresponding figures for monthly median values

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12

Husin, Asnawi, and Buldan Muslim. "EFEK GELOMBANG TSUNAMI ACEH 2004 PADA GANGGUAN IONOSFER BERGERAK SKALA MENENGAH DARI PENGAMATAN JARINGAN GPS SUMATRA." Komunikasi Fisika Indonesia 16, no. 2 (October 31, 2019): 130. http://dx.doi.org/10.31258/jkfi.16.2.130-137.

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Medium Scale Travelling Ionospheric Disturbance (MSTID), thought to be manifestation of atmospheric gravity wave (AGW) in the ionospheric altitude that propagates horizontally and effects on in the electron density structure of ionosphere. These atmospheric gravity waves sourced from lower atmospheric activities such as typhoons, volcanic eruptions and tsunamis. Wave energy by its coupling induction process can travel to the ionosphere region. It has been understood that the TID's wave structure have an impact on the propagation of radio waves in the ionosphere so that it will affect the perfo

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13

Pavelyev, A. G., K. Zhang, J. Wickert, T. Schmidt, Y. A. Liou, V. N. Gubenko, A. A. Pavelyev, R. R. Salimzjanov, and Y. Kuleshov. "Identification and localization of layers in the ionosphere using the eikonal and amplitude of radio occultation signals." Atmospheric Measurement Techniques Discussions 4, no. 2 (March 1, 2011): 1465–92. http://dx.doi.org/10.5194/amtd-4-1465-2011.

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Abstract. Conditions for communication, navigation, and remote sensing in the ionosphere and atmosphere depend strongly on the ionospheric impact on the radio waves propagation. By use of the CHAllenge Minisatellite Payload (CHAMP) radio occultation (RO) data a description of different types of the ionospheric contributions to the RO signals at the altitudes 30–90 km of the RO ray perigee is introduced and compared with results of measurements obtained earlier in the communication link satellite-to-Earth at frequency 1.5415 GHz. An analytical model is introduced for description of the radio wa

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14

Keuer, Dieter. "Estimation of ionospheric reflection height using long wave propagation." Advances in Radio Science 17 (September 19, 2019): 205–12. http://dx.doi.org/10.5194/ars-17-205-2019.

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Abstract. Phase height measurements of low frequency radio waves are used to study the long-term variability of the mesosphere over Europe. Phase height measurements use a characteristic pattern in field strength registration of radio waves interpreted as phase relations between sky wave and surface wave to obtain the apparent height of the reflection point, the Standard Phase Height (SPH). Based on this SPH-method a homogenized daily series was generated since 1959 at Kühlungsborn. Improvements of the measuring method show that the signal is significantly influenced by lower atmospheric layer

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15

Altadill, David, Antoni Segarra, Estefania Blanch, José Miguel Juan, Vadym V. Paznukhov, Dalia Buresova, Ivan Galkin, Bodo W. Reinisch, and Anna Belehaki. "A method for real-time identification and tracking of traveling ionospheric disturbances using ionosonde data: first results." Journal of Space Weather and Space Climate 10 (2020): 2. http://dx.doi.org/10.1051/swsc/2019042.

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Traveling Ionospheric Disturbances (TIDs) are wave-like propagating irregularities that alter the electron density environment and play an important role spreading radio signals propagating through the ionosphere. A method combining spectral analysis and cross-correlation is applied to time series of ionospheric characteristics (i.e., MUF(3000)F2 or foF2) using data of the networks of ionosondes in Europe and South Africa to estimate the period, amplitude, velocity and direction of propagation of TIDs. The method is verified using synthetic data and is validated through comparison of TID detec

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16

Bajcetic, Jovan, Aleksandra Nina, Vladimir Cadez, and Branislav Todorovic. "Ionospheric D-region temperature relaxation and its influences on radio signal propagation after solar X-flares occurrence." Thermal Science 19, suppl. 2 (2015): 299–303. http://dx.doi.org/10.2298/tsci141223084b.

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In this paper our attention is focused on relations between radio signal propagation characteristics and temperature changes in D-region after solar X-flare occurrence. We present temperature dependencies of electron plasma frequency, the parameter that describes medium conditions for propagation of an electromagnetic wave, and the refractive index which describes how this wave propagates. As an example for quantitative calculations based on obtained theoretical equations we choose the reaction of the D-region to the solar X-flare occurred on May 5th, 2010. The ionospheric modelling is based o

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17

Salikhov, Nazyf, Alexander Shepetov, Galina Pak, Serik Nurakynov, Azamat Kaldybayev, Vladimir Ryabov, and Valery Zhukov. "Investigation of the Pre- and Co-Seismic Ionospheric Effects from the 6 February 2023 M7.8 Turkey Earthquake by a Doppler Ionosonde." Atmosphere 14, no. 10 (September 25, 2023): 1483. http://dx.doi.org/10.3390/atmos14101483.

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During the catastrophic M7.8 earthquake in Turkey on 6 February 2023, anomalous effects were revealed in the ionosphere associated with various propagation mechanisms of seismogenic disturbance from the lithosphere up to the height of the ionosphere. Seventeen minutes after the main shock, a co-seismic disturbance was detected by a Doppler ionosonde on an inclined, 3010 km long, two-hop radio path “Kuwait—Institute of Ionosphere (Almaty)”. An appearance of acoustic waves at the height of 232 km in the ionosphere was fixed 568 s after arrival of the surface Rayleigh wave to the sub-ionospheric

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18

Borisova, T. D., N. F. Blagoveshchenskaya та A. S. Kalishin. "Forecasting the conditions of the decameter radio wave propagation in the Аrctic region". Arctic and Antarctic Research, № 3 (30 вересня 2017): 78–86. http://dx.doi.org/10.30758/0555-2648-2017-0-3-78-86.

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In this paper we present the results of studies the distinctive features of the decameter radio wave propagation based on the results of experimental measurements of radio wave propagation characteristics by the ionospheric oblique sounding (IOS) method and numerical simulation. An algorithm for numerical modeling the trajectory and energetic characteristics of the decameter radio wave propagation in the framework of geometric optics is described. The agreement between the simulated and experimental radio propagation parameters (for example, the values of the maximum observed frequencies) is d

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19

Jandieri, George, and Nika Tugushi. "Statistical Characteristics of the Temporal Spectrum of Scattered Radiation in the Equatorial Ionosphere." Journal of Environmental & Earth Sciences 5, no. 1 (April 13, 2023): 85–94. http://dx.doi.org/10.30564/jees.v5i1.5442.

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On the basis of the solution of the space-time characteristic system by the method of geometric optics using symbolic calculations, analytical and numerical simulation of the propagation of the ordinary and extraordinary radio waves in the conducting equatorial ionospheric plasma was made considering the anisotropy of plasma irregularities and non-stationary nature of propagation medium. Broadening of the spectrum and the displacement of its maximum contain velocity of a turbulent plasma flow and parameters characterizing anisotropic plasmonic structures. Statistical moments of both radio wave

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20

Robinson, T. R. "Effects of multiple scatter on the propagation and absorption of electromagnetic waves in a field-aligned-striated cold magneto-plasma: implications for ionospheric modification experiments." Annales Geophysicae 20, no. 1 (January 31, 2002): 41–55. http://dx.doi.org/10.5194/angeo-20-41-2002.

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Abstract. A new theory of the propagation of low power electromagnetic test waves through the upper-hybrid resonance layer in the presence of magnetic field-aligned plasma density striations, which includes the effects of multiple scatter, is presented. The case of sinusoidal striations in a cold magnetoplasma is treated rigorously and then extended, in an approximate manner, to the broad-band striation spectrum and warm plasma cases. In contrast to previous, single scatter theories, it is found that the interaction layer is much broader than the wavelength of the test wave. This is due to the

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21

Blagoveshchensky, D. V., and O. A. Maltseva. "Simulation of Medium Wave Propagation in the Magnetosphere." Geomagnetism and Aeronomy 62, no. 1-2 (February 2022): 58–65. http://dx.doi.org/10.1134/s0016793222020049.

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Abstract A model of the medium of the ionosphere and magnetosphere, including the distributions of the concentrations and temperatures, collision frequencies, and magnetic field parameters, is described. The ray-tracing method was used to simulate the parameters of medium radio waves in this environment. The wave trajectories were calculated in the approximation of geometric optics. When the level of solar and geomagnetic activity and the location of the transmitter and the frequency are set, the parameters of the wave paths can be calculated. Numerical modeling of the characteristics of exper

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22

Isaakidis, S. A., T. D. Xenos, and J. A. Koukos. "Ionospheric radio wave propagation finite element method modeling." Electrical Engineering (Archiv fur Elektrotechnik) 85, no. 5 (November 1, 2003): 235–39. http://dx.doi.org/10.1007/s00202-003-0176-4.

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23

Blagoveshchensky, D. V., T. D. Borisova, and J. W. MacDougall. "Irregular HF radio propagation on a subauroral path during magnetospheric substorms." Annales Geophysicae 24, no. 7 (August 9, 2006): 1839–49. http://dx.doi.org/10.5194/angeo-24-1839-2006.

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Abstract. The impact of the main ionospheric trough, sporadic structures, gradients and inhomogeneities of the subpolar ionosphere during substorms on the signal amplitude, azimuthal angles of arrival, and propagation modes for the radio path Ottawa (Canada)-St. Petersburg (Russia) was considered. This subauroral path with the length of about 6600 km has approximately an east-west orientation. The main goals are to carry out numerical modeling of radio propagation for the path and to compare the model calculations with experimental results. Wave absorption and effects of focusing and divergenc

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24

Somsikov, V. M., I. P. Chunchuzov, A. Jahanshir, and S. N. Mukasheva. "SOLAR TERMINATOR AND IONOSPHERIC PROPAGATION OF RADIO WAVES." RADIO COMMUNICATION TECHNOLOGY, no. 51 (December 30, 2021): 15–23. http://dx.doi.org/10.33286/2075-8693-2021-51-15-23.

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The paper provides a review of studies devoted to the peculiarities of the propagation of radio waves in the ionosphere in the area of the solar terminator, which is the only global and regular source of acoustic-gravitational waves and other disturbances of the ionosphere. It describes the results of theoretical works devoted to the study of perturbations created by the solar terminator in the area of the difference in the intensity of solar radiation in the atmosphere. The paper gives a review of experimental studies of the effects created by the solar terminator in the entire thickness of t

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25

Kotik, Dmitriy, Ekaterina Orlova, and Vladimir Yashnov. "Peculiarities of ULF wave characteristics in a multicomponent ionospheric plasma." Solnechno-Zemnaya Fizika 8, no. 4 (December 24, 2022): 57–65. http://dx.doi.org/10.12737/szf-84202205.

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We have examined the properties of low-frequency electromagnetic waves in multicomponent ionospheric plasma in the 1–30 Hz band, using the magnetoionic theory. Complex permittivity tensor components and refractive indices of normal waves (ordinary and extraordinary) were calculated at altitudes from 80 to 750 km. The calculations show that the refractive indices are highly dependent on frequency and height. Polarization of ordinary and extraordinary waves is elliptical over the entire range of the frequencies investigated. The refractive index and the polarization of normal waves are demonstra

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26

Kotik, Dmitriy, Ekaterina Orlova, and Vladimir Yashnov. "Peculiarities of ULF wave characteristics in a multicomponent ionospheric plasma." Solar-Terrestrial Physics 8, no. 4 (December 24, 2022): 55–62. http://dx.doi.org/10.12737/stp-84202205.

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We have examined the properties of low-frequency electromagnetic waves in multicomponent ionospheric plasma in the 1–30 Hz band, using the magnetoionic theory. Complex permittivity tensor components and refractive indices of normal waves (ordinary and extraordinary) were calculated at altitudes from 80 to 750 km. The calculations show that the refractive indices are highly dependent on frequency and height. Polarization of ordinary and extraordinary waves is elliptical over the entire range of the frequencies investigated. The refractive index and the polarization of normal waves are demonstra

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27

Zernov, N. N., M. A. Bisyarin, and V. E. Germ. "Diffraction Theory of Propagation of High-Frequency Radio Waves in a Spherically Layered Ionospheric Radio Channel." Радиотехника и электроника 68, no. 6 (June 1, 2023): 563–70. http://dx.doi.org/10.31857/s0033849423060189.

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A special analytical method is developed to describe the propagation of high-frequency electromagnetic waves emitted by a vertical point dipole from the surface of perfectly conducting Earth in a regular spherically layered background ionosphere. The basic representation of the wave field employs an integral over the set of wave components, each of which is related to a specific ray trajectory. Such an approach makes it possible to analytically take into account the effect of medium-scale 3D inclusions in the background ionosphere as an additional phase shift of the wave component with allowan

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28

Afraimovich, E. L., N. P. Perevalova, A. V. Plotnikov, and A. M. Uralov. "The shock-acoustic waves generated by earthquakes." Annales Geophysicae 19, no. 4 (April 30, 2001): 395–409. http://dx.doi.org/10.5194/angeo-19-395-2001.

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Abstract. We investigate the form and dynamics of shock-acoustic waves generated by earthquakes. We use the method for detecting and locating the sources of ionospheric impulsive disturbances, based on using data from a global network of receivers of the GPS navigation system, and require no a priori information about the place and time of the associated effects. The practical implementation of the method is illustrated by a case study of earthquake effects in Turkey (17 August and 12 November 1999), in Southern Sumatra (4 June 2000), and off the coast of Central America (13 January 2001). It

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29

Xu, Xiang, Chen Zhou, Run Shi, Binbin Ni, Zhengyu Zhao, and Yuannong Zhang. "Numerical study of the generation and propagation of ultralow-frequency waves by artificial ionospheric F region modulation at different latitudes." Annales Geophysicae 34, no. 9 (September 21, 2016): 815–29. http://dx.doi.org/10.5194/angeo-34-815-2016.

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Abstract. Powerful high-frequency (HF) radio waves can be used to efficiently modify the upper-ionospheric plasmas of the F region. The pressure gradient induced by modulated electron heating at ultralow-frequency (ULF) drives a local oscillating diamagnetic ring current source perpendicular to the ambient magnetic field, which can act as an antenna radiating ULF waves. In this paper, utilizing the HF heating model and the model of ULF wave generation and propagation, we investigate the effects of both the background ionospheric profiles at different latitudes in the daytime and nighttime iono

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30

Rapoport, Yuriy G., Oleg K. Cheremnykh, Volodymyr V. Koshovy, Mykola O. Melnik, Oleh L. Ivantyshyn, Roman T. Nogach, Yuriy A. Selivanov, et al. "Ground-based acoustic parametric generator impact on the atmosphere and ionosphere in an active experiment." Annales Geophysicae 35, no. 1 (January 5, 2017): 53–70. http://dx.doi.org/10.5194/angeo-35-53-2017.

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Abstract. We develop theoretical basics of active experiments with two beams of acoustic waves, radiated by a ground-based sound generator. These beams are transformed into atmospheric acoustic gravity waves (AGWs), which have parameters that enable them to penetrate to the altitudes of the ionospheric E and F regions where they influence the electron concentration of the ionosphere. Acoustic waves are generated by the ground-based parametric sound generator (PSG) at the two close frequencies. The main idea of the experiment is to design the output parameters of the PSG to build a cascade sche

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31

Zhang, Y., and H. C. Wu. "Dispersive propagation of trans-ionospheric pulse pairs in ionosphere." AIP Advances 12, no. 5 (May 1, 2022): 055126. http://dx.doi.org/10.1063/5.0087725.

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As the most powerful natural radio waves on earth, trans-ionospheric pulse pairs (TIPPs) are emitted by lightning and have been recorded by several satellites. TIPPs commonly consist of two radio pulses with a clear ionospheric dispersion. Here, we calculate the propagation of TIPPs across the ionosphere by use of a method accurate for sub-cycle radio pulses. One can directly obtain dispersed waveforms in the time domain and then reproduce satellite-recorded frequency spectra. Our work affords a simple and robust tool to directly compare with observation data, which should be helpful to deduce

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32

Dorogov, A. Yu, and A. I. Yashin. "SOFTWARE PACKAGE FOR MODELING HF-BAND PACKET RADIO NETWORKS." H&ES Research 12, no. 6 (2020): 26–37. http://dx.doi.org/10.36724/2409-5419-2020-12-6-26-37.

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It is noted that the complexity and constant variability of the ionosphere structure, the presence of many factors affecting the propagation of radio waves in such an environment, as well as the complex topology of communication networks lead to the need the computer modeling of data transmission in HF-band networks. The existing models of representation of ionospheric processes and digital radio channels are described. It is shown that to solve the problems of designing a radio data transmission network, complex modeling is necessary, taking into account the network topology, signal propagati

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33

Foroodi, Zahra, Mahdi Alizadeh, Harald Schuh, and Lung-Chih Tsai. "Alternative Approach for Tsunami Early Warning Indicated by Gravity Wave Effects on Ionosphere." Remote Sensing 13, no. 11 (May 30, 2021): 2150. http://dx.doi.org/10.3390/rs13112150.

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The rapid displacement of the ocean floor during large ocean earthquakes or volcanic eruptions causes the propagation of tsunami waves on the surface of the ocean, and consequently internal gravity waves (IGWs) in the atmosphere. IGWs pierce through the troposphere and into the ionospheric layer. In addition to transferring energy to the ionosphere, they cause significant variations in ionospheric parameters, so they have considerable effects on the propagation of radio waves through this dispersive medium. In this study, double-frequency measurements of the Global Positioning System (GPS) and

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34

Marshall, R. A., and F. W. Menk. "Observations of Pc 3-4 and Pi 2 geomagnetic pulsations in the low-latitude ionosphere." Annales Geophysicae 17, no. 11 (November 30, 1999): 1397–410. http://dx.doi.org/10.1007/s00585-999-1397-2.

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Abstract. Day-time Pc 3–4 (~5–60 mHz) and night-time Pi 2 (~5–20 mHz) ULF waves propagating down through the ionosphere can cause oscillations in the Doppler shift of HF radio transmissions that are correlated with the magnetic pulsations recorded on the ground. In order to examine properties of these correlated signals, we conducted a joint HF Doppler/magnetometer experiment for two six-month intervals at a location near L = 1.8. The magnetic pulsations were best correlated with ionospheric oscillations from near the F region peak. The Doppler oscillations were in phase at two different altit

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35

Chisham, G., and M. Pinnock. "Assessing the contamination of SuperDARN global convection maps by non-F-region backscatter." Annales Geophysicae 20, no. 1 (January 31, 2002): 13–28. http://dx.doi.org/10.5194/angeo-20-13-2002.

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Abstract. Global convection mapping using line-of-sight Doppler velocity data from the Super Dual Auroral Radar Network (SuperDARN) is now an accepted method of imaging high-latitude ionospheric convection. This mapping process requires that the flow measured by the radars is defined solely by the convection electric field. This is generally only true of radar backscatter from the ionospheric F-region. We investigate the extent to which the E-region and ground backscatter in the SuperDARN data set may be misidentified as F-region backscatter, and assess the contamination of global convection m

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36

Gong, Hongwei, Hanxian Fang, and Zeyun Li. "Numerical Simulation of Ionospheric Disturbances Due to Rocket Plume and Its Influence on HF Radio Waves Propagation." Universe 8, no. 6 (June 15, 2022): 331. http://dx.doi.org/10.3390/universe8060331.

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In this paper, the ionospheric disturbances of CO2, which is released by rocket exhaust plumes, was simulated. The effect of this disturbance on the propagation of high-frequency (HF) radio waves at different incident frequencies was also simulated by using three-dimensional digital ray tracing technique. The results show that CO2 can effectively dissipate the background electrons and form ionospheric holes after being released in the ionosphere. At the peak height of ionospheric electron density (about 300 km), the electrons are dissipated fastest and the radius of ionospheric hole is also la

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37

Hughes, J. M., W. A. Bristow, R. A. Greenwald, and R. J. Barnes. "Determining characteristics of HF communications links using SuperDARN." Annales Geophysicae 20, no. 7 (July 31, 2002): 1023–30. http://dx.doi.org/10.5194/angeo-20-1023-2002.

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Abstract. Space weather effects can strongly influence high-frequency (HF) communications by changing the ionospheric environment through which the radio waves propagate. Since many systems utilize HF communications, the ability to make real-time assessments of propagation conditions is an important part of space weather monitoring systems. In this paper, we present new techniques for measuring high-latitude HF communications link parameters using data from SuperDARN radars. These techniques use ground-scatter returns to define the variation in skip distance with frequency. From these data, th

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38

Chan, A. H. Y., and P. S. Cannon. "Nonlinear forecasts of ƒ<i>o</i>F2: variation of model predictive accuracy over time." Annales Geophysicae 20, no. 7 (July 31, 2002): 1031–38. http://dx.doi.org/10.5194/angeo-20-1031-2002.

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Анотація:

Abstract. Space weather effects can strongly influence high-frequency (HF) communications by changing the ionospheric environment through which the radio waves propagate. Since many systems utilize HF communications, the ability to make real-time assessments of propagation conditions is an important part of space weather monitoring systems. In this paper, we present new techniques for measuring high-latitude HF communications link parameters using data from SuperDARN radars. These techniques use ground-scatter returns to define the variation in skip distance with frequency. From these data, th

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39

Zhilinsky, Alexey P., and Vladimir F. Degtyarev. "TUNNEL BROADENING OF RESONANT LEVELS IN LAYERED QUANTUM-SIZE STRUCTURES." SYNCHROINFO JOURNAL 9, no. 1 (2023): 30–37. http://dx.doi.org/10.36724/2664-066x-2023-9-1-30-37.

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The microparticles interaction with potential barriers of various nature and form is the quantum physics and nanoelectronics basis. The nature of this interaction largely determines modern radio engineering devices and complexes operation, information transmission and processing systems. At present, semiconductor quantum-well structures, in particular heterostructures with quantum wells (QWs) and barriers (QWs), occupy leading positions as materials for opto- and nanoelectronics. It has been found that chain consisting of a sequence formation of potential wells and barriers gives rise to reson

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40

Borisova, Tatiana, Nataly Blagoveshchenskaya, Alexey Kalishin, and Andrey Kovalev. "Determination of the vector velocity of artificial ionospheric irregularities based on Doppler measurements by the bi-static scatter method of HF radio signals propagating over long radio paths." Solar-Terrestrial Physics 10, no. 2 (June 25, 2024): 74–92. http://dx.doi.org/10.12737/stp-102202408.

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During experiments on the modification of the high-latitude ionosphere by high-power HF radio waves of ordinary or extraordinary polarization of the EISCAT/Heating facility (Tromsø, Norway) in 2013, 2016, and 2019, Doppler measurements of diagnostic HF radio signals over long radio paths were carried out by the bistatic scatter method. We studied characteristics of Doppler frequency variations in bistatic scattered radio signals, using the experimental results obtained along radio paths of different lengths (up to ~8500 km) and orientation. We examined numerical dependences of the Doppler freq

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41

Edwards, Danielle, and Manuel Cervera. "Seasonal Variation in Land and Sea Surface Backscatter Coefficients at High Frequencies." Remote Sensing 14, no. 21 (November 2, 2022): 5514. http://dx.doi.org/10.3390/rs14215514.

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Over the horizon radars (OTHR) rely on the propagation of high frequency (HF) radio waves via the ionosphere to successfully achieve their designated missions. Backscatter sounders (BSS) are environmental over-the-horizon radars which may be used to assess the ionospheric propagation conditions. However, high power observed by a BSS may be due to either good ionospheric propagation, a high surface backscatter coefficient, or a combination of both. Hence, an understanding of the surface backscatter coefficients and their temporal variation is essential to fully understand the ionospheric propag

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42

Füllekrug, M., C. Hanuise, and M. Parrot. "Simulating satellite observations of 100 kHz radio waves from relativistic electron beams above thunderclouds." Atmospheric Chemistry and Physics Discussions 10, no. 10 (October 7, 2010): 23149–67. http://dx.doi.org/10.5194/acpd-10-23149-2010.

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Abstract. Relativistic electron beams above thunderclouds emit 100 kHz radio waves which illuminate the Earth's atmosphere and near-Earth space. This contribution aims to clarify the physical processes which are relevant for the spatial spreading of the radio wave energy below and above the ionosphere and thereby enables simulating satellite observations of 100 kHz radio waves from relativistic electron beams above thunderclouds. The simulation uses the DEMETER satellite which observes 100 kHz radio waves from fifty terrestrial Long Range Aid to Navigation (LORAN) transmitters. Their mean lumi

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43

Füllekrug, M., C. Hanuise, and M. Parrot. "Experimental simulation of satellite observations of 100 kHz radio waves from relativistic electron beams above thunderclouds." Atmospheric Chemistry and Physics 11, no. 2 (January 24, 2011): 667–73. http://dx.doi.org/10.5194/acp-11-667-2011.

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Анотація:

Abstract. Relativistic electron beams above thunderclouds emit 100 kHz radio waves which illuminate the Earth's atmosphere and near-Earth space. This contribution aims to clarify the physical processes which are relevant for the spatial spreading of the radio wave energy below and above the ionosphere and thereby enables an experimental simulation of satellite observations of 100 kHz radio waves from relativistic electron beams above thunderclouds. The simulation uses the DEMETER satellite which observes 100 kHz radio waves from fifty terrestrial Long Range Aid to Navigation (LORAN) transmitte

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44

Pushin, V. F., and L. F. Chernogor. "A SYNTHESIS OF TEMPORAL VARIATIONS IN DOPPLER SPECTRA RECORDED AT A QUASI-VERTICAL INCIDENCE BY THE HF DOPPLER RADAR WITH SPACED RECEIVERS." Radio physics and radio astronomy 26, no. 3 (September 14, 2021): 211–23. http://dx.doi.org/10.15407/rpra26.03.211.

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Purpose: The ionospheric channel is widely used for the communication, radio navigation, radar, direction finding, radio astronomy, and remote radio probing systems. The radio channel parameters are characterized by nonstationarity due to the dynamic processes in the ionosphere, and therefore their study is one of the topical problems of space radio physics and earth-space radio physics of geospace. This work aims at presenting the results of synthesis of temporal variations in the Doppler spectra obtained by the Doppler probing of the ionosphere at vertical and quasi-vertical incidence. Desig

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45

Xu, Xin, Ling Huang, Shun Wang, Yicai Ji, Xiaojun Liu, and Guangyou Fang. "VLF/LF Lightning Location Based on LWPC and IRI Models: A Quantitative Study." Remote Sensing 14, no. 22 (November 16, 2022): 5784. http://dx.doi.org/10.3390/rs14225784.

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The group velocity of lightning electromagnetic signals plays an important role in lightning location systems using the time difference of arrival (TDOA) method. Accurate estimation of group velocity is difficult due to the space- and time-varying properties of the Earth’s ionospheric waveguide. Besides, the analytical solution of the group velocity is difficult to obtain from the classic mode theory, especially when higher-order modes, anisotropic geomagnetic background, diffuse ionosphere profile, and propagation path segmentation are all taken into consideration. To overcome these challenge

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46

Бернгардт, Олег, and Oleg Berngardt. "Space weather impact on radio device operation." Solar-Terrestrial Physics 3, no. 3 (October 9, 2017): 37–53. http://dx.doi.org/10.12737/stp-33201705.

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This paper reviews the space weather impact on operation of radio devices. The review is based on recently published papers, books, and strategic scientific plans of space weather investigations. The main attention is paid to ionospheric effects on propagation of radiowaves, basically short ones. Some examples of such effects are based on 2012–2016 ISTP SB RAS EKB radar data: attenuation of ground backscatter signals during solar flares, effects of traveling ionospheric disturbances of different scales in ground backscatter signals, effects of magnetospheric waves in ionospheric scatter signal

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47

Witvliet, Ben A., Rosa M. Alsina-Pagès, Erik van Maanen, and Geert Jan Laanstra. "Design and Validation of Probes and Sensors for the Characterization of Magneto-Ionic Radio Wave Propagation on Near Vertical Incidence Skywave Paths." Sensors 19, no. 11 (June 9, 2019): 2616. http://dx.doi.org/10.3390/s19112616.

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This article describes the design and validation of deployable low-power probes and sensors to investigate the influence of the ionosphere and the Earth’s magnetic field on radio wave propagation below the plasma frequency of the ionosphere, known as Near Vertical Incidence Skywave (NVIS) propagation. The propagation of waves that are bent downward by the ionosphere is dominated by a bi-refractive mechanism called ‘magneto-ionic propagation’. The polarization of both downward waves depends on the spatial angle between the Earth’s magnetic field and the direction of propagation of the radio wav

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48

Zhbankov, G. A., and N. P. Danilkin. "INTERACTION OF SHORT-WAVE ELECTROMAGNETIC WAVES WITH SMALL-SCALE IONOSPHERIC INHOMOGENEITIES OF THE POLAR IONOSPHERE (part II)." RADIO COMMUNICATION TECHNOLOGY, no. 47 (November 23, 2020): 45–56. http://dx.doi.org/10.33286/2075-8693-2020-47-45-56.

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The results of a comparative analysis of the data of computational and field experiments reflecting the peculiarities of the impact of small-scale inhomogeneities of electron concentration in the Earth's ionosphere on the characteristics of radio wave propagation during vertical ground-based and satellite sounding of the ionosphere are presented. It has been proved that these inhomogeneities are the cause of noticeable distortions of traces in ionograms. The simulation results confirm the possibility of determining the degree of concentration change in a small-scale inhomogeneous structure fro

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49

Jiang, Xiaoli, Huimin Li, Lixin Guo, Dalin Ye, Kehu Yang, and Jiawen Li. "Research on the Ionospheric Delay of Long-Range Short-Wave Propagation Based on a Regression Analysis." Remote Sensing 16, no. 3 (January 31, 2024): 553. http://dx.doi.org/10.3390/rs16030553.

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The ionospheric delay effect is inevitable when a radio signal propagates through the ionosphere. It has been extensively studied in the L-band. Typically, the influence of the ionosphere on the code phase and carrier phase is regarded as the same. In this study, a numerical ratio between the group delay time and phase advance time with reference to the study of the L-band is investigated in the short-wave band. The variation in the numerical ratio with frequency, critical frequency, and elevation angle is discussed in detail. There appears an interesting phenomenon wherein the elevation angle

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50

Gauld, J. K., T. K. Yeoman, J. A. Davies, S. E. Milan, and F. Honary. "SuperDARN radar HF propagation and absorption response to the substorm expansion phase." Annales Geophysicae 20, no. 10 (October 31, 2002): 1631–45. http://dx.doi.org/10.5194/angeo-20-1631-2002.

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Abstract. Coherent scatter HF ionospheric radar systems such as SuperDARN offer a powerful experimental technique for the investigation of the magnetospheric substorm. However, a common signature in the early expansion phase is a loss of HF backscatter, which has limited the utility of the radar systems in substorm research. Such data loss has generally been attributed to either HF absorption in the D-region ionosphere, or the consequence of regions of very low ionospheric electric field. Here observations from a well-instrumented isolated substorm which resulted in such a characteristic HF ra

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