Academic literature on the topic 'Geomagnetic substorm'

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Journal articles on the topic "Geomagnetic substorm"

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Yagova, Nadezda, Natalia Nosikova, Lisa Baddeley, et al. "Non-triggered auroral substorms and long-period (1–4 mHz) geomagnetic and auroral luminosity pulsations in the polar cap." Annales Geophysicae 35, no. 3 (2017): 365–76. http://dx.doi.org/10.5194/angeo-35-365-2017.

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Abstract. A study is undertaken into parameters of the polar auroral and geomagnetic pulsations in the frequency range 1–4 mHz (Pc5∕Pi3) during quiet geomagnetic intervals preceding auroral substorms and non-substorm background variations. Special attention is paid to substorms that occur under parameters of the interplanetary magnetic field (IMF) conditions typical for undisturbed days (non-triggered substorms). The spectral parameters of pulsations observed in auroral luminosity as measured by a meridian scanning photometer (Svalbard) in the polar cap and near the polar boundary of the auror
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Guineva, Veneta, Irina Despirak, Rolf Werner, Rumiana Bojilova, and Lyubomira Raykova. "Mid-latitude effects of “expanded” geomagnetic substorms: a case study." EPJ Web of Conferences 254 (2021): 01004. http://dx.doi.org/10.1051/epjconf/202125401004.

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The goal of this work is to examine the effects of the “expanded” or “high-latitude” substorms at mid-latitudes. These substorms are generated at auroral latitudes and propagate up to geomagnetic latitudes above ∼70° GMLat. They are usually observed during reccurent high-speed streams (HSS) from coronal holes. To identify the substorm activity, data from the networks IMAGE, SuperMAG and INTERMAGNET, and data from the all-sky cameras in Lovozero were used. To verify the interplanetary and geomagnetic conditions, data from the CDAWeb OMNI and from the WDC for geomagnetism at Kyoto were taken. We
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Lu, Li, Qinglong Yu, Shuai Jia, Zhong Xie, Jian Lan, and Yuan Chang. "Simulation of Dynamic Evolution of Ring Current Ion Flux by a Lunar Base Energetic Neutral Atom (ENA) Imaging." Astronomy 2, no. 3 (2023): 153–64. http://dx.doi.org/10.3390/astronomy2030011.

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The distribution of energetic ion flux in the ring current region, such as a meteorological cumulonimbus cloud, stores up the particle energy for a geomagnetic substorm. It is helpful to study the geomagnetic substorm mechanism by using a lunar base ENA imaging simulation of the dynamic evolution of the ring current, and establishing the corresponding relationship between key node events of the substorm. Based on the previous observation experience and our simulation results of the dynamic evolution of the ring current, we propose a macroscopic model of substorms related to the dynamic evoluti
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Iyemori, T., and D. R. K. Rao. "Decay of the Dst field of geomagnetic disturbance after substorm onset and its implication to storm-substorm relation." Annales Geophysicae 14, no. 6 (1996): 608–18. http://dx.doi.org/10.1007/s00585-996-0608-3.

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Abstract. In order to investigate the causal relationship between magnetic storms and substorms, variations of the mid-latitude geomagnetic indices, ASY (asymmetric part) and SYM (symmetric part), at substorm onsets are examined. Substorm onsets are defined by three different phenomena; (1) a rapid increase in the mid-latitude asymmetric-disturbance indices, ASY-D and ASY-H, with a shape of so-called `mid-latitude positive bay\\'; (2) a sharp decrease in the AL index; (3) an onset of Pi2 geomagnetic pulsation. The positive bays are selected using eye inspection and a pattern-matching technique
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Belova, E., S. Kirkwood, and H. Tammet. "The effect of magnetic substorms on near-ground atmospheric current." Annales Geophysicae 18, no. 12 (2000): 1623–29. http://dx.doi.org/10.1007/s00585-001-1623-z.

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Abstract. Ionosphere-magnetosphere disturbances at high latitudes, e.g. magnetic substorms, are accompanied by energetic particle precipitation and strong variations of the ionospheric electric fields and currents. These might reasonably be expected to modify the local atmospheric electric circuit. We have analysed air-earth vertical currents (AECs) measured by a long wire antenna at Esrange, northern Sweden during 35 geomagnetic substorms. Using superposed epoch analysis we compare the air-earth current variations during the 3 h before and after the time of the magnetic X-component minimum wi
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Куражковская, Надежда, Nadezhda Kurazhkovskaya, Борис Клайн, and Boris Klain. "Effect of geomagnetic activity, solar wind and parameters of interplanetary magnetic field on regularities in intermittency of Pi2 geomagnetic pulsations." Solnechno-Zemnaya Fizika 1, no. 3 (2015): 11–20. http://dx.doi.org/10.12737/11551.

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We present the results of investigation of the influence of geomagnetic activity, solar wind and parameters of the interplanetary magnetic field (IMF) on properties of the intermittency of midlatitude burst series of Pi2 geomagnetic pulsations observed during magnetospheric substorms on the nightside (substorm Pi2) and in the absence of these phenomena (nonsub-storm Pi2). We considered the index α as a main characteristic of intermittency of substorm and nonsubstorm Pi2 pulsations. The index α characterizes the slope of the cumulative distribution function of Pi2 burst amplitudes. The study in
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Wild, J. A., E. E. Woodfield, and S. K. Morley. "On the triggering of auroral substorms by northward turnings of the interplanetary magnetic field." Annales Geophysicae 27, no. 9 (2009): 3559–70. http://dx.doi.org/10.5194/angeo-27-3559-2009.

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Abstract. Some studies over the last decade have indicated that the instability responsible for substorm expansion phase onset may require an external trigger such as a northward turning of the interplanetary magnetic field (IMF). Statistical investigations have lead to contrasting interpretations regarding the relationship between proposed solar wind triggers and substorm onsets identified from geomagnetic data. We therefore present the results of a study into the possible triggering of 260 substorms between 2001–2005, exploiting data from the Cluster and IMAGE satellite missions. We find tha
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Wang, H., and H. Lühr. "The efficiency of mechanisms driving Subauroral Polarization Streams (SAPS)." Annales Geophysicae 29, no. 7 (2011): 1277–86. http://dx.doi.org/10.5194/angeo-29-1277-2011.

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Abstract. We have investigated the seasonal and diurnal variation of SAPS (Subauroral Polarization Streams) occurrence based on 3663 SAPS events identified in DMSP ion drift observations in the Northern Hemisphere during July 2001 and June 2003. Their relationships with high latitude convection electric field, substorm, and ionospheric conductivity have been addressed. SAPS occurrences show a clear seasonal and diurnal variation with the occurrence rates varying by a factor of 5. It is found that the convection electric field might play a dominant role in association with SAPS occurrence. Peak
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Guineva, Veneta, Irina Despirak, and Natalia Kleimenova. "Substorms manifestation at high and mid-latitudes during two large magnetic storm." Aerospace Research in Bulgaria 31 (2019): 27–39. http://dx.doi.org/10.3897/arb.v31.e03.

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The dynamics of magnetic substorms at high and middle latitudes during two severe geomagnetic storms: on 17March 2015 and on 22–23 June2015has been analyzed. The storms were rather similar: both storms were a result of the solar wind Sheath impact and both storms were characterized by a strong intensity (SYM/Hmin<–200nT). We studied the magnetic substorms during these storms on the base of the INTERMAGNET and IMAGE networks data. The attendant solar wind and Interplanetary Magnetic Field (IMF) parameters were taken from the OMNI data base. The spatial-temporal dynamics of three substorms wa
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Pulkkinen, A., A. Thomson, E. Clarke, and A. McKay. "April 2000 geomagnetic storm: ionospheric drivers of large geomagnetically induced currents." Annales Geophysicae 21, no. 3 (2003): 709–17. http://dx.doi.org/10.5194/angeo-21-709-2003.

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Abstract. Geomagnetically induced currents (GIC) flowing in technological systems on the ground are a direct manifestation of space weather. Due to the proximity of very dynamic ionospheric current systems, GIC are of special interest at high latitudes, where they have been known to cause problems, for example, for normal operation of power transmission systems and buried pipelines. The basic physics underlying GIC, i.e. the magnetosphere – ionosphere interaction and electromagnetic induction in the ground, is already quite well known. However, no detailed study of the drivers of GIC has been
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Dissertations / Theses on the topic "Geomagnetic substorm"

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Uwamahoro, Jean. "An analysis of sources and predictability of geomagnetic storms." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1005236.

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Solar transient eruptions are the main cause of interplanetary-magnetospheric disturbances leading to the phenomena known as geomagnetic storms. Eruptive solar events such as coronal mass ejections (CMEs) are currently considered the main cause of geomagnetic storms (GMS). GMS are strong perturbations of the Earth’s magnetic field that can affect space-borne and ground-based technological systems. The solar-terrestrial impact on modern technological systems is commonly known as Space Weather. Part of the research study described in this thesis was to investigate and establish a relationship be
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Yamamoto, Kazuhiro. "Excitation of High-m Poloidal ULF Waves in the Inner Magnetosphere during Geomagnetic Storms and Substorms: Importance of Radial Gradient of Proton Distributions in Drift-Bounce Resonance." Kyoto University, 2020. http://hdl.handle.net/2433/253099.

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Tsareva, Olga. "Variabilité temporelle du champ magnétique terrestre et son influence sur l'environnement spatial proche." Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30122.

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Le champ magnétique terrestre connaît une forte variabilité temporelle avec des périodes caractéristiques aussi courtes que la dizaine de secondes (sous-orages magnétosphériques responsables du déclenchement des aurores polaires) et aussi longues que le million d'années (inversions de la polarité nord-sud). Ses variations temporelles, bien que d'origine et de caractéristiques très différentes, affectent la dynamique de l'environnement spatial proche de la Terre : précipitation de particules dans la haute atmosphère, modification des flux de particules cosmiques, échappement atmosphérique. La p
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Spencer, Edmund Augustus. "Analysis of geomagnetic storms and substorms with the WINDMI model." Thesis, 2006. http://hdl.handle.net/2152/2604.

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Mays, Mona Leila. "The study of interplanetary shocks, geomagnetic storms, and substorms with the WINDMI model." 2009. http://hdl.handle.net/2152/10703.

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WINDMI is a low dimensional plasma physics-based model of the coupled magnetosphere-ionosphere system. The nonlinear system of ordinary differential equations describes the energy balance between the basic nightside components of the system using the solar wind driving voltage as input. Of the eight dynamical variables determined by the model, the region 1 field aligned current and ring current energy is compared to the westward auroral electrojet AL index and equatorial geomagnetic disturbance storm time Dst index. The WINDMI model is used to analyze the magnetosphere-ionosphere system during
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Books on the topic "Geomagnetic substorm"

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Soviet-Finnish Auroral Workshop (1st 1984 Leningrad, R.S.F.S.R.). Proceedings of the first Soviet-Finnish Auroral Workshop, October 1-6, 1984 in Leningrad, USSR. Finnish Academy of Science and Letters, Sodankylä Geophysical Observatory, 1986.

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Finnish-American Auroral Workshop (3rd 1985 Sodankylä, Finland). Proceedings of the third Finnish-American Auroral Workshop, October 14-18, 1985 in Sodankylä, Finland. Finnish Academy of Science and Letters, Sodankylä Geophysical Observatory, 1986.

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United States. National Aeronautics and Space Administration., ed. Magnetospheric substorms and tail dynamics: Final technical report. National Aeronautics and Space Administration, 1998.

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Soviet-Finnish Auroral Workshop (2nd 1986 Murmansk, R.S.F.S.R.). Proceedings of the Second Soviet-Finnish Auroral Workshop, Murmansk, October 20-25, 1986. Edited by Bösinger T, Tanskanen P. J, and Uspenskiĭ M. V. Commission for Scientific and Technical Co-operation between Finland and the USSR, 1987.

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United States. National Aeronautics and Space Administration., ed. Ion drift meter research: Final report 1 January 1992 - 31 December 1993. The University of Texas at Dallas, 1994.

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Moore, T. E. The geopause. National Aeronautics and Space Administration, 1995.

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C, Delcourt D., and George C. Marshall Space Flight Center., eds. The geopause. NASA Marshall Space Flight Center, 1995.

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Dorman, Lev I. Plasmas and Energetic Processes in the Geomagnetosphere: Plasmas/Magnetic and Current Sheets, Reconnections, Particle Acceleration, and Substorms. Nova Science Publishers, Incorporated, 2017.

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Burch, James L., and Vassilis Angelopoulos. THEMIS Mission. Springer New York, 2010.

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Book chapters on the topic "Geomagnetic substorm"

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Hanumath Sastri, J., R. Sridharan, and Tarun Kumar Pant. "Equatorial ionosphere-thermosphere system during geomagnetic storms." In Disturbances in Geospace: The Storm-Substorm Relationship. American Geophysical Union, 2003. http://dx.doi.org/10.1029/142gm16.

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Baker, D. N., and X. Li. "Relativistic electron flux enhancements during strong geomagnetic activity." In Disturbances in Geospace: The Storm-Substorm Relationship. American Geophysical Union, 2003. http://dx.doi.org/10.1029/142gm18.

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Vassiliadis, D., A. J. Klimas, J. A. Valdivia, and D. N. Baker. "Substorm Expansion as Seen from the Ground: Models of the Geomagnetic Signature." In Substorms-4. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4798-9_14.

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Baishev, D. G., E. S. Barkova, S. I. Solovyev, and K. Yumoto. "Response of Eastward Electrojet and IPDP Geomagnetic Pulsations to the Substorm Expansion Phase." In Substorms-4. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4798-9_120.

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Kleimenova, N. G., O. V. Kozyreva, M. Bitterly, and J. Bitterly. "Substorm Onset Effect in the Dayside Polar Cusp 1–5 mHz Geomagnetic Pulsations." In Substorms-4. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4798-9_125.

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Kamide, Y., J. H. Shue, and M. Brittnacher. "Effects of solar wind density on the auroral electrojets and global auroras during geomagnetic storms." In Disturbances in Geospace: The Storm-Substorm Relationship. American Geophysical Union, 2003. http://dx.doi.org/10.1029/142gm02.

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Grande, M., C. H. Perry, A. Hall, J. Fennell, R. Nakamura, and Y. Kamide. "What is the effect of substorms on the ring current ion population during a geomagnetic storm?" In Disturbances in Geospace: The Storm-Substorm Relationship. American Geophysical Union, 2003. http://dx.doi.org/10.1029/142gm08.

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Lin, N., R. J. Walker, R. L. McPherron, and M. G. Kivelson. "Magnetic islands in the near geomagnetic tail and its implications for the mechanism of 1054 UT CDAW 6 substorm." In Physics of Magnetic Flux Ropes. American Geophysical Union, 1990. http://dx.doi.org/10.1029/gm058p0647.

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Iyemori, T. "Substorms as a Dissipation Process in Geomagnetic Storms." In Substorms-4. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4798-9_20.

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Shirapov, D. Sh, V. M. Mishin, V. D. Urbanovich, and V. V. Mishin. "Some Problems of the Polar Cap and Geomagnetic Tail Dynamics." In Substorms-4. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4798-9_87.

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Conference papers on the topic "Geomagnetic substorm"

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Kleimenova, N. G., J. Manninen, T. Turunen, et al. "Unexpected high-frequency “birds”-type VLF emissions." In Physics of Auroral Phenomena. FRC KSC RAS, 2020. http://dx.doi.org/10.37614/2588-0039.2020.43.008.

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The new typeof daytime natural VLF whistler mode emissions of the magnetospheric origin was recently found in the VLF observations at Kannuslehto station (L ~ 5.5) in Northern Finland.These VLF events occurred at the frequencies above 4-5 kHzeven up to 15 kHz. Here we present the different spectra of this peculiar daytime high-frequency VLF emissions observed under quiet geomagnetic conditions at auroral latitudes at Kannuslehto (Finland) and Lovozero (Russia) stations. These high-frequency waves cannot be attributed to typical well known VLF chorus and hiss. They became visible on the spectro
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Reports on the topic "Geomagnetic substorm"

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BARKHATOV, NIKOLAY, and SERGEY REVUNOV. A software-computational neural network tool for predicting the electromagnetic state of the polar magnetosphere, taking into account the process that simulates its slow loading by the kinetic energy of the solar wind. SIB-Expertise, 2021. http://dx.doi.org/10.12731/er0519.07122021.

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The auroral activity indices AU, AL, AE, introduced into geophysics at the beginning of the space era, although they have certain drawbacks, are still widely used to monitor geomagnetic activity at high latitudes. The AU index reflects the intensity of the eastern electric jet, while the AL index is determined by the intensity of the western electric jet. There are many regression relationships linking the indices of magnetic activity with a wide range of phenomena observed in the Earth's magnetosphere and atmosphere. These relationships determine the importance of monitoring and predicting ge
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Kleimenova, Natalia G., A. Odzimek, S. Michnowski, and M. Kubicki. Geomagnetic Storms and Substorms as Space Weather I nfluence on Atmospheric Electric Field Variations. Balkan, Black Sea and Caspian Sea Regional Network on Space Weather Studies, 2018. http://dx.doi.org/10.31401/sungeo.2018.01.14.

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