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Journal articles on the topic 'Ionosphere'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Kliore, A. J. "Satellite Atmospheres and Magnetospheres." Highlights of Astronomy 11, no. 2 (1998): 1065–69. http://dx.doi.org/10.1017/s1539299600019602.

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AbstractGalileo radio-occultation measurements show that all four of the Galilean satellites possess ionospheres. Peak ionospheric densities for the icy satellites are several thousand electrons per cubic centimeter, and the distributions are not spherically symmetric. Io’s ionosphere is much denser and remarkably similar to that measured by Voyager.

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Rao, N. D. Parameswara, E. Sneha Priya, Sk Haneef, K. Sowmya, U. Abhishek Chowdary, and U. Sushmita. "ThingSpeak an IOT Application and Analytics System for GNSS with MATLAB Analysis." International Journal of Innovative Research in Engineering and Management 10, no. 3 (2023): 189–92. http://dx.doi.org/10.55524/ijirem.2023.10.3.28.

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The ionosphere is an essential component of the Global Navigation Satellite System (GNSS) that can affect the accuracy and dependability of GNSS location. MATLAB provides comprehensive tools for the analysis of ionospheric data and its impact on GNSS positioning. To examine the ionospheric data utilized in GNSS positioning, we advise utilizing MATLAB in this application. The analysis is based on a determination of the Total Electron Content (TEC) of the ionosphere in order to account for the ionospheric delay in the GNSS signals. The system consists of a GNSS receiver module connected to a mic

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Xu, Baoyi, Wenqiang Huang, Peng Ren, Yi Li, and Zheng Xiang. "Modeling and Forecasting Ionospheric foF2 Variation Based on CNN-BiLSTM-TPA during Low- and High-Solar Activity Years." Remote Sensing 16, no. 17 (2024): 3249. http://dx.doi.org/10.3390/rs16173249.

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The transmission of high-frequency signals over long distances depends on the ionosphere’s reflective properties, with the selection of operating frequencies being closely tied to variations in the ionosphere. The accurate prediction of ionospheric critical frequency foF2 and other parameters in low latitudes is of great significance for understanding ionospheric changes in high-frequency communications. Currently, deep learning algorithms demonstrate significant advantages in capturing characteristics of the ionosphere. In this paper, a state-of-the-art hybrid neural network is utilized in co

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Prajapati, Parinda, and Nimisha Patel. "Ionospheric Model Development for Indian Region: A Survey Paper." ECS Transactions 107, no. 1 (2022): 11075–82. http://dx.doi.org/10.1149/10701.11075ecst.

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Ionosphere’s role is most important in vigorous satellite communication for the navigation positional correctness purpose. Ionosphere contains diverse layers reliant on its electron density with altitude in the layer. There are various ionospheric models to forecast electron density with temporal resolutions cited by literatures. GPS data is frequently used by these models. So, the necessity is a prerequisite of evolving ionospheric models with different time duration for low latitudes of India. Also, an ionosphere tomography is considered as an ill-posed problem. Ionospheric TEC found simulta

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Saka, Osuke. "Ionospheric control of space weather." Annales Geophysicae 39, no. 3 (2021): 455–60. http://dx.doi.org/10.5194/angeo-39-455-2021.

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Abstract. As proposed by Saka (2019), plasma injections arising out of the auroral ionosphere (ionospheric injection) are a characteristic process of the polar ionosphere at substorm onset. The ionospheric injection is triggered by westward electric fields transmitted from the convection surge in the magnetosphere at field line dipolarization. Localized westward electric fields result in local accumulation of ionospheric electrons and ions, which produce local electrostatic potentials in the auroral ionosphere. Field-aligned electric fields are developed to extract excess charges from the iono

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Farah, Ashraf. "Single-Frequency Ionospheric-Delay Correction from BeiDou & GPS Systems for Northern Hemisphere." Artificial Satellites 54, no. 1 (2019): 1–15. http://dx.doi.org/10.2478/arsa-2019-0002.

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Abstract The range delay caused by the ionosphere layer is the major current source of error for GNSS users with single-frequency receivers. GNSS advice users to correct this type of error using ionospheric models whose coefficients are sent in their navigation messages. GPS-users use the Klobuchar model to correct this type of error. GPS navigation message contains the model’s eight coefficients which vary on the basis of seasonal ionospheric variations and average solar flux. The correction accuracy of Klobuchar model is about 50% (rms) of the ionospheric range delay. Beidou system calculate

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Karpachev, Alexander. "Advanced Classification of Ionospheric Troughs in the Morning and Evening Conditions." Remote Sensing 14, no. 16 (2022): 4072. http://dx.doi.org/10.3390/rs14164072.

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The separation and classification of ionospheric troughs in the winter evening and morning ionospheres of the southern hemisphere were performed using CHAMP satellite data for high solar activity (2000–2002). In the high-latitude ionosphere, the main ionospheric trough (MIT) was separated from the high-latitude trough (HLT). The separation was carried out using a thorough analysis of all the characteristic structures of the ionosphere in the framework of the auroral diffuse particle precipitation model. Two types of high-latitude troughs were identified: (1) a wide trough associated with zone

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Elsayed, Ahmed, Ahmed Sedeek, Mohamed Doma, and Mostafa Rabah. "Vertical ionospheric delay estimation for single-receiver operation." Journal of Applied Geodesy 13, no. 2 (2019): 81–91. http://dx.doi.org/10.1515/jag-2018-0041.

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Abstract An apparent delay is occurred in GPS signal due to both refraction and diffraction caused by the atmosphere. The second region of the atmosphere is the ionosphere. The ionosphere is significantly related to GPS and the refraction it causes in GPS signal is considered one of the main source of errors which must be eliminated to determine accurate positions. GPS receiver networks have been used for monitoring the ionosphere for a long time. The ionospheric delay is the most predominant of all the error sources. This delay is a function of the total electron content (TEC). Because of the

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9

Janhunen, P. "On the possibility of using an electromagnetic ionosphere in global MHD simulations." Annales Geophysicae 16, no. 4 (1998): 397–402. http://dx.doi.org/10.1007/s00585-998-0397-y.

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Abstract. Global magnetohydrodynamic (MHD) simulations of the Earth's magnetosphere must be coupled with a dynamical ionospheric module in order to give realistic results. The usual approach is to compute the field-aligned current (FAC) from the magnetospheric MHD variables at the ionospheric boundary. The ionospheric potential is solved from an elliptic equation using the FAC as a source term. The plasma velocity at the boundary is the E × B velocity associated with the ionospheric potential. Contemporary global MHD simulations which include a serious ionospheric model use this method, which

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10

Danzer, J., S. B. Healy, and I. D. Culverwell. "A simulation study with a new residual ionospheric error model for GPS radio occultation climatologies." Atmospheric Measurement Techniques 8, no. 8 (2015): 3395–404. http://dx.doi.org/10.5194/amt-8-3395-2015.

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Abstract. In this study, a new model was explored which corrects for higher order ionospheric residuals in Global Positioning System (GPS) radio occultation (RO) data. Recently, the theoretical basis of this new "residual ionospheric error model" has been outlined (Healy and Culverwell, 2015). The method was tested in simulations with a one-dimensional model ionosphere. The proposed new model for computing the residual ionospheric error is the product of two factors, one of which expresses its variation from profile to profile and from time to time in terms of measurable quantities (the L1 and

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Danzer, J., S. B. Healy, and I. D. Culverwell. "A simulation study with a new residual ionospheric error model for GPS radio occultation climatologies." Atmospheric Measurement Techniques Discussions 8, no. 1 (2015): 1151–76. http://dx.doi.org/10.5194/amtd-8-1151-2015.

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Abstract. In this study, a new model was explored, which corrects for higher order ionospheric residuals in global positioning system (GPS) radio occultation (RO) data. Recently, the theoretical basis of this new "residual ionospheric error model" has been outlined (Healy and Culverwell, 2015). The method was tested in simulations with a one-dimensional model ionosphere. The proposed new model for computing the residual ionospheric error is the product of two factors, one of which expresses its variation from profile-to-profile and from time-to-time in terms of measurable quantities (the L1 an

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Романова, Елена, Elena Romanova, Галина Котович, et al. "Modeling z-shaped disturbance along the Pedersen ray of oblique sounding ionogram using adaptation of IRI to experimental data." Solnechno-Zemnaya Fizika 2, no. 4 (2016): 43–53. http://dx.doi.org/10.12737/21815.

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We present the results of numerical modeling of a traveling ionospheric disturbance that causes z-shaped bends at the Pedersen ray of oblique incidence ionograms. The results of trajectory synthesis of oblique incidence ionograms are given for the ionosphere, taking into account the traveling ionospheric disturbance. In the work, we use the International Reference Ionosphere, adapted to experimental data, and the Model of Ionosphere and Plasmasphere.

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Parker, James A. D., S. Eleri Pryse, Natasha Jackson-Booth, and Rachel A. Buckland. "Modelling the main ionospheric trough using the Electron Density Assimilative Model (EDAM) with assimilated GPS TEC." Annales Geophysicae 36, no. 1 (2018): 125–38. http://dx.doi.org/10.5194/angeo-36-125-2018.

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Abstract. The main ionospheric trough is a large-scale spatial depletion in the electron density distribution at the interface between the high- and mid-latitude ionosphere. In western Europe it appears in early evening, progresses equatorward during the night, and retreats rapidly poleward at dawn. It exhibits substantial day-to-day variability and under conditions of increased geomagnetic activity it moves progressively to lower latitudes. Steep gradients on the trough-walls on either side of the trough minimum, and their variability, can cause problems for radio applications. Numerous studi

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Hayes, Laura A., and Peter T. Gallagher. "A Significant Sudden Ionospheric Disturbance Associated with Gamma-Ray Burst GRB 221009A." Research Notes of the AAS 6, no. 10 (2022): 222. http://dx.doi.org/10.3847/2515-5172/ac9d2f.

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Abstract We report the detection of a significant sudden ionospheric disturbance in the D-region of Earth’s ionosphere (∼60–100 km), which was associated with the massive γ-ray burst GRB 221009A that occurred on 2022 October 9. We identified the disturbance over northern Europe—a result of the increased ionization by X- and γ-ray emission from the GRB-using very low frequency radio waves as a probe of the D-region. These observations demonstrate that an extra-galactic GRB (z ∼ 0.151) can have a significant impact on the terrestrial atmosphere and illustrates that the Earth’s ionosphere can be

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Sassi, Fabrizio, Angeline G. Burrell, Sarah E. McDonald, Jennifer L. Tate, and John P. McCormack. "On the importance of middle-atmosphere observations on ionospheric dynamics using WACCM-X and SAMI3." Annales Geophysicae 42, no. 1 (2024): 255–69. http://dx.doi.org/10.5194/angeo-42-255-2024.

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Abstract. Recent advances in atmospheric observations and modeling have enabled the investigation of thermosphere–ionosphere interactions as a whole-atmosphere problem. This study examines how dynamical variability in the middle atmosphere (MA) affects intra-day changes in the thermosphere and ionosphere. Specifically, this study investigates ionosphere–thermosphere interactions during different time periods of January 2013 using the Specified Dynamics Whole Atmosphere Community Climate Model, eXtended version (SD-WACCM-X), coupled to the Naval Research Laboratory (NRL) ionosphere of the Sami3

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Ким, Антон, Anton Kim, Елена Романова, et al. "Modeling z-shaped disturbance along the Pedersen ray of oblique sounding ionogram using adaptation of IRI to experimental data." Solar-Terrestrial Physics 2, no. 4 (2017): 55–69. http://dx.doi.org/10.12737/24273.

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We present the results of numerical modeling of a traveling ionospheric disturbance that causes z-shaped bends at the Pedersen ray of oblique incidence ionograms. The results of trajectory synthesis of oblique incidence ionograms are given for the ionosphere, taking into account the traveling ionospheric disturbance. In the work, we use the International Reference Ionosphere, adapted to experimental data, and the Global Model of the Ionosphere and Plasmasphere.

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Peng, YuXiang, and Wayne A. Scales. "Ionospheric Remote Sensing with GNSS." Encyclopedia 1, no. 4 (2021): 1246–56. http://dx.doi.org/10.3390/encyclopedia1040094.

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The Global Navigation Satellite System (GNSS) plays a pivotal role in our modern positioning, navigation and timing (PNT) technologies. GNSS satellites fly at altitudes of approximately 20,000 km or higher. This altitude is above an ionized layer of the Earth’s upper atmosphere, the so called “ionosphere”. Before reaching a typical GNSS receiver on the ground, GNSS satellite signals penetrate through the Earth’s ionosphere. The ionosphere is a plasma medium consisting of free charged particles that can slow down, attenuate, refract, or scatter the GNSS signals. Ionospheric density structures (

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18

An, Xiangdong, Xiaolin Meng, Hua Chen, Weiping Jiang, Ruijie Xi, and Qusen Chen. "Modelling Global Ionosphere Based on Multi-Frequency, Multi-Constellation GNSS Observations and IRI Model." Remote Sensing 12, no. 3 (2020): 439. http://dx.doi.org/10.3390/rs12030439.

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With the emergence of BeiDou and Galileo as well as the modernization of GPS and GLONASS, more available satellites and signals enhance the capability of Global Navigation Satellite Systems (GNSS) to monitor the ionosphere. However, currently the International GNSS Service (IGS) Ionosphere Associate Analysis Centers (IAACs) just use GPS and GLONASS dual-frequency observations in ionosphere estimation. To better determine the global ionosphere, we used multi-frequency, multi-constellation GNSS observations and a priori International Reference Ionosphere (IRI) to model the ionosphere. The newly

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19

Chisham, G., M. Pinnock, A. S. Rodger, and J. P. Villain. "High-time resolution conjugate SuperDARN radar observations of the dayside convection response to changes in IMF B<sub>y</sub>." Annales Geophysicae 18, no. 2 (2000): 191–201. http://dx.doi.org/10.1007/s00585-000-0191-y.

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Abstract. We present data from conjugate SuperDARN radars describing the high-latitude ionosphere's response to changes in the direction of IMF By during a period of steady IMF Bz southward and Bx positive. During this interval, the radars were operating in a special mode which gave high-time resolution data (30 s sampling period) on three adjacent beams with a full scan every 3 min. The location of the radars around magnetic local noon at the time of the event allowed detailed observations of the variations in the ionospheric convection patterns close to the cusp region as IMF By varied. A si

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Chen, Zhou, Bokun An, Wenti Liao, et al. "Ionospheric Electron Density Model by Electron Density Grid Deep Neural Network (EDG-DNN)." Atmosphere 14, no. 5 (2023): 810. http://dx.doi.org/10.3390/atmos14050810.

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Electron density (or electron concentration) is a critical metric for characterizing the ionosphere’s mobility. Shortwave technologies, remote sensing systems, and satellite communications—all rely on precise estimations of electron density in the ionosphere. Using electron density profiles from FORMOSAT-3/COSMIC (Constellation Observation System for Meteorology, Ionosphere, and Climate) from 2006 to 2013, a four-dimensional physical grid model of ionospheric electron density was created in this study. The model, known as EDG-DNN, utilizes a DNN (deep neural network), and its output is the ele

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Yamada, Fábio, Luiz V. G. Tarelho, and Mauro V. Lima. "Observation of the evolution of the 25th solar cycle by measuring the ionospheric delay using the GPS P3 method in southeastern BrazilGPS P3 method in southeastern Brazil." Acta IMEKO 14, no. 2 (2025): 1–6. https://doi.org/10.21014/actaimeko.v14i2.1969.

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Ionospheric refraction generates time delay and signal fading in the electromagnetic signals, which can cause errors in the receiver. These errors can range from a few meters in location to total signal unavailability, depending on the ionisation level of the ionosphere plasma. The parameter to evaluate the behaviour of the ionosphere is the Total Electron Content (TEC). This article will present the relationship between the evolution of the number of sunspots of the 25th solar cycle and the Vertical TEC (VTEC) measurement made by a geodetic receiver in the city of Xerém (Brazil). We applied t

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El Manaily, Emad, Mahmoud Abd Rabbou, Adel El-Shazly, and Moustafa Baraka. "Enhanced Local Ionosphere Model for Multi-Constellations Single Frequency Precise Point Positioning Applications: Egyptian Case Study." Artificial Satellites 53, no. 4 (2018): 141–57. http://dx.doi.org/10.2478/arsa-2018-0011.

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Abstract The positioning accuracy of single frequency precise point positioning (SFPPP) attributes mainly to the ionosphere error, which strongly affects GNSS signals. When GNSS signals pass through the various ionosphere layers, they will be bent and their speed will be changed due to dispersive nature of ionosphere. To correct the ionosphere error, it is common to use Klobuchar ionosphere model or Global Ionosphere Maps (GIM). However, Klobuchar can deal with only about 50% of the Ionosphere effect and global Ionosphere maps are often inadequate to describe detailed features of local ionosph

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Liu, Hao, Wang Gao, Weiwei Miao, Shuguo Pan, Xiaolin Meng, and Longlei Qiao. "Research on Reliable Long-Baseline NRTK Positioning Method Considering Ionospheric Residual Interpolation Uncertainty." Remote Sensing 15, no. 22 (2023): 5353. http://dx.doi.org/10.3390/rs15225353.

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In the past few decades, network real-time kinematic (NRTK) positioning technology has developed rapidly. Generally, in the continuously operating reference stations (CORS) network, within a moderate baseline length, e.g., 80–100 km, atmospheric delay can be effectively processed through regional modeling and, thus, can support almost instantaneous centimeter-level NRTK positioning. However, in long-baseline CORS networks, especially during the active period of the ionosphere, ionospheric delays cannot be fully eliminated through modeling, leading to decreased NRTK positioning accuracy. To add

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Vybornov, F. I., and O. A. Sheiner. "Coronal mass ejections and high-speed solar wind streams effect on HF ionospheric communication channel." Journal of Physics: Conference Series 2131, no. 5 (2021): 052096. http://dx.doi.org/10.1088/1742-6596/2131/5/052096.

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Abstract This article analyzes the degree of solar coronal mass ejections and high-speed solar wind streams influence on the ionospheric communication channel in the short-wavelength range. Regularities in the coronal mass ejections influence on the parameters of the ionosphere are revealed. It is shown that there is a decrease in the values of the used differential parameter of critical frequency of the ionosphere F2 layer after the onset of coronal mass ejections of the loop type, while no significant changes are observed from other types of coronal mass ejections. The contribution of the hi

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Riabova, S. A., and S. L. Shalimov. "Response of the lower and upper ionosphere after the eruption of Shiveluch volcano on april 10, 2023." Геомагнетизм и аэрономия 64, no. 1 (2024): 113–21. http://dx.doi.org/10.31857/s0016794024010114.

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The disturbances in the lower ionosphere and in the region of the maximum of the ionospheric F2 layer during the Shiveluch volcanic eruption in April 2023 are analyzed based on data from ground-based magnetometers and GPS radio sounding of the ionosphere. The magnetic stations were located at distances of 455 km (Paratunka) and 752 km (Magadan) from the volcano. The variations in the magnetic field and total electron content of the ionosphere were studied as characteristics of the ionospheric response to this event. An analysis of the measurements showed that the impact on the ionosphere is ca

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Mitchell, C. N., I. K. Walker, S. E. Pryse, I. Kersley, I. W. McCrea, and T. B. Jones. "<i>Letter to the Editor:</i> First complementary observations by ionospheric tomography, the EISCAT Svalbard radar and the CUTLASS HF radar." Annales Geophysicae 16, no. 11 (1998): 1519–22. http://dx.doi.org/10.1007/s00585-998-1519-2.

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Abstract. Experimental results are presented from ionospheric tomography, the EISCAT Svalbard radar and the CUTLASS HF radar. Tomographic measurements on 10 October 1996, showing a narrow, field-aligned enhancement in electron density in the post-noon sector of the dayside auroral zone, are related to a temporal increase in the plasma concentration observed by the incoherent scatter radar in the region where the HF radar indicated a low velocity sunwards convection. The results demonstrate the complementary nature of these three instruments for polar-cap ionospheric studies.Key words. Ionosphe

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Jee, Geonhwa. "Fundamentals of Numerical Modeling of the Mid-latitude Ionosphere." Journal of Astronomy and Space Sciences 40, no. 1 (2023): 11–18. http://dx.doi.org/10.5140/jass.2023.40.1.11.

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The ionosphere is one of the key components of the near-Earth’s space environment and has a practical consequence to the human society as a nearest region of the space environment to the Earth. Therefore, it becomes essential to specify and forecast the state of the ionosphere using both the observations and numerical models. In particular, numerical modeling of the ionosphere is a prerequisite not only for better understanding of the physical processes occurring within the ionosphere but also for the specification and forecast of the space weather. There are several approaches for modeling th

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Back, Junho, Geonhwa Jee, Hyuck-Jin Kwon, et al. "Classification of Ionograms Obtained from Vertical Incidence Pulsed Ionospheric Radar (VIPIR)/Dynasonde Ionospheric Radar at Jang Bogo Station, Antarctica." Journal of Astronomy and Space Sciences 42, no. 2 (2025): 39–46. https://doi.org/10.5140/jass.2025.42.2.39.

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The electron density profiles produced from the ionospheric sounding system are traditionally estimated by the inversion procedure based on the image analysis of the observed ionograms. Jang Bogo Vertical Incidence Pulsed Ionospheric Radar (VIPIR) with Dynasonde (hereafter, JVD), however, uses the three-dimensional electron density inversion approach named “NeXtYZ” to produce ionospheric density, ion velocity, and tilt of the ionization in the bottomside ionosphere based on the list of detected radio echoes with their physical parameters. Sometimes, the resulting density profiles can be errone

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YASAR, Mehmet. "Response of the Turkish Ionosphere to Geomagnetic Storms During the 24th Solar Cycle." Hendese Teknik Bilimler ve Mühendislik Dergisi 1, no. 2 (2024): 50–56. https://doi.org/10.5281/zenodo.13996448.

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The Earth's ionosphere, a haven for charged particles within the atmosphere, is susceptible to energetic excitations from space weather. When geomagnetic storms erupt, triggered by solar activity, a cascade of charged particles rushes towards our planet. These charged particles, among other factors, have dynamic and disruptive effects on Earth’s ionosphere. The foremost among these effects are significant fluctuations in the ionospheric electron density during geomagnetic storms. This study investigates the effects of 54 geomagnetic storms of different magnitudes on the Turkish ionospher

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Cherniak, Iurii, David Altadill, Irina Zakharenkova, et al. "Combination of High-Rate Ionosonde Measurements with COSMIC-2 Radio Occultation Observations for Reference Ionosphere Applications." Atmosphere 16, no. 7 (2025): 804. https://doi.org/10.3390/atmos16070804.

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Knowledge of ionospheric plasma altitudinal distribution is crucial for the effective operation of radio wave propagation, communication, and navigation systems. High-frequency sounding radars—ionosondes—provide unbiased benchmark measurements of ionospheric plasma density due to a direct relationship between the frequency of sound waves and ionospheric electron density. But ground-based ionosonde observations are limited by the F2 layer peak height and cannot probe the topside ionosphere. GNSS Radio Occultation (RO) onboard Low-Earth-Orbiting satellites can provide measurements of plasma dist

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Ясюкевич, Юрий, Yury Yasyukevich, Илья Живетьев, and Ilya Zhivetiev. "Using network technology for studying the ionosphere." Solnechno-Zemnaya Fizika 1, no. 3 (2015): 21–27. http://dx.doi.org/10.12737/10545.

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One of the key problems of ionosphere physics is the coupling between different ionospheric regions. We apply networks technology for studying the coupling of changing ionospheric dynamics in different regions. We used data from global ionosphere maps (GIM) of total electron content (TEC) produced by CODE for 2005–2010. Distribution of cross-correlation function maxima of TEC variations is not simple. This distribution allows us to reveal two levels of ionosphere coupling: «strong» (r&#62;0.9) and «weak» (r&#62;0.72). The ionosphere of the Arctic region upper 50° magnetic latitude is c

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Salikhov, N. M., and G. D. Pak. "EXPERIMENTAL STUDY OF DISTRIBUTION OF PERTURBATIONS FROM THE LITHOSPHERE TO IONOSPHERE AT THE EXAMPLE OF UNDERGROUND NUCLEAR EXPLOSIONS AND EARTHQUAKES." NNC RK Bulletin, no. 2 (June 30, 2018): 69–77. http://dx.doi.org/10.52676/1729-7885-2018-2-69-77.

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Lithosphere-atmospheric-ionospheric relations have been investigated at the example of the perturbations propagation from the lithosphere to ionosphere during underground nuclear explosions at the Semipalatinsk test site and two earthquakes (Mb = 3.5 and Mb = 3.6) near Almaty. Simultaneously, seven days prior to the earthquake the abnormal effects in variations of intensity of a gamma-ray flux, temperatures, acoustic impulses and the Doppler frequency shift of ionospheric signal are registered by a complex of the measuring equipment installed in the mountain area. A retrospective analysis of t

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Lu, Shikun, Hao Zhang, Xihai Li, et al. "Complex network description of the ionosphere." Nonlinear Processes in Geophysics 25, no. 1 (2018): 233–40. http://dx.doi.org/10.5194/npg-25-233-2018.

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Abstract. Complex networks have emerged as an essential approach of geoscience to generate novel insights into the nature of geophysical systems. To investigate the dynamic processes in the ionosphere, a directed complex network is constructed, based on a probabilistic graph of the vertical total electron content (VTEC) from 2012. The results of the power-law hypothesis test show that both the out-degree and in-degree distribution of the ionospheric network are not scale-free. Thus, the distribution of the interactions in the ionosphere is homogenous. None of the geospatial positions play an e

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Kim, Mingyu, and Jeongrae Kim. "SBAS-Aided GPS Positioning with an Extended Ionosphere Map at the Boundaries of WAAS Service Area." Remote Sensing 13, no. 1 (2021): 151. http://dx.doi.org/10.3390/rs13010151.

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Space-based augmentation system (SBAS) provides correction information for improving the global navigation satellite system (GNSS) positioning accuracy in real-time, which includes satellite orbit/clock and ionospheric delay corrections. At SBAS service area boundaries, the correction is not fully available to GNSS users and only a partial correction is available, mostly satellite orbit/clock information. By using the geospatial correlation property of the ionosphere delay information, the ionosphere correction coverage can be extended by a spatial extrapolation algorithm. This paper proposes

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Long, Yanchen, Qinghui Zhang, Zhengquan Dai, and Jian Rong. "Investigation of Ionospheric Disturbance and Seismic Events Based on Machine Learning." Highlights in Science, Engineering and Technology 9 (September 30, 2022): 37–42. http://dx.doi.org/10.54097/hset.v9i.1712.

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Earthquakes are natural disasters that endanger human life and cause the greatest loss of property. The study of anomalous disturbance of the ionosphere, one of the pre-earthquake anomalies, will help to further study the coupling effect on the ionosphere before the earthquake. This paper focuses on the analysis of the importance and influence of various parameters inside the seismic ionosphere under earthquake conditions, constructs a classification and prediction model of seismic ionospheric anomalies based on the gradient boosting decision tree GBDT algorithm, and analyzes the pre-earthquak

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Shen, Emma, Dominic Anstey, Eloy de Lera Acedo, Anastasia Fialkov, and Will Handley. "Quantifying ionospheric effects on global 21-cm observations." Monthly Notices of the Royal Astronomical Society 503, no. 1 (2021): 344–53. http://dx.doi.org/10.1093/mnras/stab429.

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ABSTRACT We modelled the two major layer of Earth’s ionosphere, the F-layer and the D-layer, by a simplified spatial model with temporal variance to study the chromatic ionospheric effects on global 21-cm observations. From the analyses, we found that the magnitude of the ionospheric disruptions due to ionospheric refraction and absorption can be greater than the expected global 21-cm signal, and the variation of its magnitude can differ, depending on the ionospheric conditions. Within the parameter space adopted in the model, the shape of the global 21-cm signal is distorted after propagating

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Håkansson, Martin. "Nadir-Dependent GNSS Code Biases and Their Effect on 2D and 3D Ionosphere Modeling." Remote Sensing 12, no. 6 (2020): 995. http://dx.doi.org/10.3390/rs12060995.

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Recent publications have shown that group delay variations are present in the code observables of the BeiDou system, as well as to a lesser degree in the code observables of the global positioning system (GPS). These variations could potentially affect precise point positioning, integer ambiguity resolution by the Hatch–Melbourne–Wübbena linear combination, and total electron content estimation for ionosphere modeling from global navigation satellite system (GNSS) observations. The latter is an important characteristic of the ionosphere and a prerequisite in some applications of precise positi

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Rothkaehl, H., A. Krakowski, I. Stanislawska, et al. "Wave and plasma measurements and GPS diagnostics of the main ionospheric trough as a hybrid method used for Space Weather purposes." Annales Geophysicae 26, no. 2 (2008): 295–304. http://dx.doi.org/10.5194/angeo-26-295-2008.

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Abstract. The region of the main ionospheric trough is a unique region of the ionosphere, where different types of waves and instabilities can be generated. This region of the ionosphere acts like a lens, focusing a variety of indicators from the equator of plasmapause and local ionospheric plasma. This paper reports the results of monitoring the mid-latitude trough structure, dynamics and wave activity. For these purposes, the data gathered by the currently-operating DEMETER satellite and past diagnostics located on IK-19, Apex, and MAGION-3 spacecraft, as well as TEC measurements were used.

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Aburjania, G. D., K. Z. Chargazia, G. V. Jandieri, A. G. Khantadze, and O. A. Kharshiladze. "On the new modes of planetary-scale electromagnetic waves in the ionosphere." Annales Geophysicae 22, no. 4 (2004): 1203–11. http://dx.doi.org/10.5194/angeo-22-1203-2004.

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Abstract. Using an analogy method the frequencies of new modes of the electromagnetic planetary-scale waves (with a wavelength of 103 km or more), having a weather forming nature, are found at different ionospheric altitudes. This method gives the possibility to determine spectra of ionospheric electromagnetic perturbations directly from the dynamic equations without solving the general dispersion equation. It is shown that the permanently acting factor-latitude variation of the geomagnetic field generates fast and slow weakly damping planetary electromagnetic waves in both the E- and F-layers

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Denisenko, V. V., M. Y. Boudjada, M. Horn, et al. "Ionospheric conductivity effects on electrostatic field penetration into the ionosphere." Natural Hazards and Earth System Sciences 8, no. 5 (2008): 1009–17. http://dx.doi.org/10.5194/nhess-8-1009-2008.

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Abstract. The classic approach to calculate the electrostatic field penetration, from the Earth's surface into the ionosphere, is to consider the following equation ∇·(σ·∇Φ)=0 where σ and Φ are the electric conductivity and the potential of the electric field, respectively. The penetration characteristics strongly depend on the conductivities of atmosphere and ionosphere. To estimate the electrostatic field penetration up to the orbital height of DEMETER satellite (about 700 km) the role of the ionosphere must be analyzed. It is done with help of a special upper boundary condition for the atmo

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Riabova, S. A., and S. L. Shalimov. "On geomagnetic and ionospheric variations after the strong eruption of Shiveluch volcano 2023." Физика земли, no. 4 (August 19, 2024): 111–22. http://dx.doi.org/10.31857/s0002333724040089.

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Ground-based magnetometers and vertical ionospheric sounding stations were used to record specific variations in the geomagnetic field caused by disturbances in the current systems of the lower ionosphere and the electron density of the upper ionosphere after a strong volcanic eruption in Kamchatka (Russia) on April 10, 2023. Analysis of the measurement results of two series of explosions showed that the impact on the lower ionosphere is carried out through both seismic Rayleigh waves (which are a source of acoustic waves propagating into the ionosphere), and atmospheric internal gravity waves

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Wang, Zhe, Qing Jin Ma, Cun Shen, Jing Fan, Chun Hua Jiang, and Chen Zhou. "Research on Visualization of Characteristic Parameters of Ionosphere." Applied Mechanics and Materials 614 (September 2014): 676–80. http://dx.doi.org/10.4028/www.scientific.net/amm.614.676.

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In this article, the author uses computer graphics visual programming method and visually expresses ionospheric characteristic parameters. Firstly, the significance of visualization of ionospheric characteristic parameters was described, then visualization process and methods were discussed, and finally the results of visualization of ionospheric parameters in typical conditions were given. The results show that visualization method of ionosphere characteristic parameters can directly reflect ionospheric electron density, electron temperature and other parameters, which is conductive to an int

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Mochalov, Vladimir, and Anastasia Mochalova. "Application of deep learning methods to predict ionosphere parameters in real time." E3S Web of Conferences 196 (2020): 02007. http://dx.doi.org/10.1051/e3sconf/202019602007.

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In this paper, the previously obtained results on recognition of ionograms using deep learning are expanded to predict the parameters of the ionosphere. After the ionospheric parameters have been identified on the ionogram using deep learning in real time, we can predict the parameters for some time ahead on the basis of the new data obtained Examples of predicting the ionosphere parameters using an artificial recurrent neural network architecture long short-term memory are given. The place of the block for predicting the parameters of the ionosphere in the system for analyzing ionospheric dat

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Wang, Chen, Zhang, Meng, and Wang. "Performance of Selected Ionospheric Models in Multi-Global Navigation Satellite System Single-Frequency Positioning over China." Remote Sensing 11, no. 17 (2019): 2070. http://dx.doi.org/10.3390/rs11172070.

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Ionospheric delay as the major error source needs to be properly handled in multi-GNSS (Global Navigation Satellite System) single-frequency positioning and the different ionospheric models exhibit apparent performance difference. In this study, two single-frequency positioning solutions with different ionospheric corrections are utilized to comprehensively analyze the ionospheric delay effects on multi-frequency and multi-constellation positioning performance, including standard point positioning (SPP) and ionosphere-constrained precise point positioning (PPP). The four ionospheric models stu

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Ridley, A. J., T. I. Gombosi, and D. L. DeZeeuw. "Ionospheric control of the magnetosphere: conductance." Annales Geophysicae 22, no. 2 (2004): 567–84. http://dx.doi.org/10.5194/angeo-22-567-2004.

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Abstract. It is well known that the ionosphere plays a role in determining the global state of the magnetosphere. The ionosphere allows magnetospheric currents to close, thereby allowing magnetospheric convection to occur. The amount of current which can be carried through the ionosphere is mainly determined by the ionospheric conductivity. This paper starts to quantify the nonlinear relationship between the ionospheric conductivity and the global state of the magnetosphere. It is found that the steady-state magnetosphere acts neither as a current nor as a voltage generator; a uniform Hall con

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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 (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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Zhang, Z., R. T. Desai, O. Shebanits, F. L. Johansson, Y. Miyake, and H. Usui. "Simulating Secondary Electron and Ion Emission from the Cassini Spacecraft in Saturn’s Ionosphere." Planetary Science Journal 4, no. 6 (2023): 105. http://dx.doi.org/10.3847/psj/acd844.

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Abstract The Cassini spacecraft’s Grand Finale flybys through Saturn’s ionosphere provided unprecedented insight into the composition and dynamics of the gas giant’s upper atmosphere and a novel and complex spacecraft–plasma interaction. In this article, we further study Cassini’s interaction with Saturn’s ionosphere using three-dimensional particle-in-cell simulations. We focus on how electrons and ions, emitted from spacecraft surfaces due to the high-velocity impact of atmospheric water molecules, could have affected the spacecraft potential and low-energy plasma measurements. The simulatio

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Villain, J. P., R. André, M. Pinnock, R. A. Greenwald, and C. Hanuise. "A Statistical study of the Doppler spectral width of high-latitude ionospheric F-region echoes recorded with SuperDARN coherent HF radars." Annales Geophysicae 20, no. 11 (2002): 1769–81. http://dx.doi.org/10.5194/angeo-20-1769-2002.

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Abstract. The HF radars of the Super Dual Auroral Radar Network (SuperDARN) provide measurements of the E × B drift of ionospheric plasma over extended regions of the high-latitude ionosphere. We have conducted a statistical study of the associated Doppler spectral width of ionospheric F-region echoes. The study has been conducted with all available radars from the Northern Hemisphere for 2 specific periods of time. Period 1 corresponds to the winter months of 1994, while period 2 covers October 1996 to March 1997. The distributions of data points and average spectral width are presented as a

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Surkov, Vadim, and Vyacheslav Pilipenko. "Can seismogenic atmospheric current influence the ionosphere?" Annals of Geophysics 67, no. 1 (2024): PA107. http://dx.doi.org/10.4401/ag-9031.

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The question of whether earthquake precursors can arise in the ionosphere is of a special interest in geophysics. Despite numerous encouraging reports on seismo-ionospheric effects, the mechanism of the lithosphere-atmosphere-ionosphere coupling (LAIC) during the crust destruction phase was not revealed yet. One of hypothesis assumes that a seismogenic current transfers an abnormal electric field from the near-surface atmosphere to the ionosphere prior to an earthquake occurrence. This current can be caused by the air ionization due to enhancement of radon gas emission from the soil or upward

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Wild, J. A., S. E. Milan, S. W. H. Cowley, et al. "Coordinated interhemispheric SuperDARN radar observations of the ionospheric response to flux transfer events observed by the Cluster spacecraft at the high-latitude magnetopause." Annales Geophysicae 21, no. 8 (2003): 1807–26. http://dx.doi.org/10.5194/angeo-21-1807-2003.

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Abstract. At 10:00 UT on 14 February 2001, the quartet of ESA Cluster spacecraft were approaching the Northern Hemisphere high-latitude magnetopause in the post-noon sector on an outbound trajectory. At this time, the interplanetary magnetic field incident upon the dayside magnetopause was oriented southward and duskward (BZ negative, BY positive), having turned from a northward orientation just over 1 hour earlier. As they neared the magnetopause the magnetic field, electron, and ion sensors on board the Cluster spacecraft observed characteristic field and particle signatures of magnetospheri

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