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Издания подборки 31 - 40 из 51
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31.
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Авторы:
Sokolov Vasiliy Dmitrievich, Danilov A. A., Samsonov Sergey Nikolaevich
Заглавие: Dependence of semi-diurnal variation of auroral absorption on a geomagnetic disturbance

Количество страниц: 4 с.

From data of riometer observations from 1986 to 1993 at stations of Kotelny Island, Tixie Bay and Zhigansk the semi-diurnal variations of occurrence frequency of auroral absorption and their dependence on geomagnetic activity have been determined. It has been found that the phase of semi-diurnal variation maximum is systematically shifted to earlier hours with the rise of geomagnetic disturbance. The reason of this experimental fact is discussed.

Sokolov, V. D. Dependence of semi-diurnal variation of auroral absorption on a geomagnetic disturbance / V. D. Sokolov, A. A. Danilov, S. N. Samsonov // Physics of auroral phenomena : proceedings of the 26th annual seminar, 25 - 28 February 2003. – 2003. – P. 91-94.

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32.
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Авторы:
Velichko Vitaly Andreevich, Boroyev Roman Nikolaevich, Plotnikov Igor Yakovlevich, Baishev Dmitriy Gavrilievich
Заглавие: Effect of Bγ IMF in substorm current wedge formation

Количество страниц: 4 с.

Based on the data of longitudinal chain of midlatitude stations in the northern hemisphere, substorm-associated field-alighned currents (FACs) are examined. A comparison of IMF component variations with surface FAC characteristics in substorm sites is performed. It is shown that the ratio between the upward and downward surface FAC intensities depends on By IMF. In this regard, the conditions are discussed that favor currents flowing from the dayside cusp to nightside auroral region. These currents, which position is dependent on By IMF direction, can be responsible for difference between the upward and downward current-wedge-associated FACs.

Effect of Bγ IMF in substorm current wedge formation / V. A. Velichko, R. N. Boroev, I. Ya. Plotnikov, D. G. Baishev // Physics of auroral phenomena : proceedings of the 26th annual seminar, 25 - 28 February 2003. – 2003. – P. 45-48.

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33.
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Авторы:
Baishev Dmitriy Gavrilievich, Velichko Vitaly Andreevich, Antonova Elizaveta Evgenievna, Gromova Lyudmila Ivanovna, Stepanova Marina Vladimirovna, Kovrazhkin Rostislav Alekseevich, Bosqued Jean-Michel
Заглавие: Splitting of auroral electrojets: ground-based and satellite data

Количество страниц: 3 с.

Splitting of auroral electrojets: ground-based and satellite data / D. G. Baishev, V. A. Velichko, E. E. Antonova, L. I. Gromova, M. V. Stepanova, R. A. Kovrazhkin, J. M. Bosqued // Physics of auroral phenomena : proceedings of the 26th annual seminar, 25 - 28 February 2003. – 2003. – P. 9-11.

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34.
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Авторы:
Sokolov Vasiliy Dmitrievich, Samsonov Sergey Nikolaevich
Заглавие: Dependence of appearance frequency of auroral absorption on its intensity

Количество страниц: 4 с.

Sokolov, V. D. Dependence of appearance frequency of auroral absorption on its intensity / V. D. Sokolov, S. N. Samsonov // Physics of auroral phenomena : proceedings of the 25th annual seminar, Apatity, 26 February – 1 March 2002. – 2002. – P. 55-58.

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35.
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Авторы:
Khalipov Victor Lavrentievich, Galperin Yury Ilyich, Stepanov Alexander Egorovich, Bondar Elena Dmitrievna
Заглавие: Formation of polarization jet during injection of ions into the inner magnetosphere

Количество страниц: 4 с.

Long-lasting ground based measurements of a polarization jet (PJ) by the latitudinal chain of ionospheric stations in Yakutia (3 < L < 5; MLT = UT + 9 h) and by 5 subauroral Russian stations were analyzed. A number of cases were found when PJ was recorded simultaneously with energetic ion observations by AMPTE/CCE and INTERBALL 2. The data comparison shows that at least in the considered cases of strong magnetic substorms, PJ was accompanied by strong injection of ions with the energy of ~20-50 keV and intensity of ~10 cm-² c-¹ sr-¹keV-¹. Close to the injection region in the near midnight sector no ion dispersion was observed, but in the evening sector nose events were detected. In accordance with the mechanism suggested by Southwood and Wolf (JGR, 1978, 83, 5227) PJ was observed near the equatorial boundary of energetic ion penetration into the magnetosphere. Measurements by ionosonds at different longitudes show that the westward velocity of the frontt of PJ development is close to the gradient drift velocity of 20 keV ions (forming nose events). Thus, the physical mechanism of PJ formation due to energetic ion injection during a strong substorm burst is experimentally confirmed. Satellite measurements show that in the near midnight sector energetic ions reach the shell L=3.0 in 20-30 minutes after a substorm commencement with AE>500 nT.

Formation of polarization jet during injection of ions into the inner magnetosphere / V. L. Khalipov, Yu. I. Galperin, A. E. Stepanov, E. D. Bondar // Physics of auroral phenomena : proceedings of the 25th annual seminar, Apatity, 26 February – 1 March 2002. – 2002. – P. 43-46.
DOI: 10.1016/S0273-1177(03)00016-4

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36.
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Авторы:
Velichko Vitaly Andreevich, Boroyev Roman Nikolaevich, Gelberg Mikhail Germanovich, Baishev Dmitriy Gavrilievich, Olson John, Morris Robert John, Yumoto Kiyohumi
Заглавие: Asymmetry in substorm development in the earth's northern and southern hemispheres

Количество страниц: 4 с.

Asymmetry in substorm development in the earth's northern and southern hemispheres / V. A. Velichko, R. N. Boroyev, M. G. Gelberg, D. G. Baishev, J. V. Olson, R. J. Morris, K. Yumoto // Physics of auroral phenomena : proceedings of the 25th annual seminar, Apatity, 26 February – 1 March 2002. – 2002. – P. 33-36.

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37.
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Автор:
Boroyev Roman Nikolaevich
Заглавие: Dynamics of field-aligned currents during substorms

Количество страниц: 3 с.

Boroyev, R. N. Dynamics of field-aligned currents during substorms / R. N. Boroyev // Physics of auroral phenomena : proceedings of the 25th annual seminar, Apatity, 26 February – 1 March 2002. – 2002. – P. 9-11.

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38.
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Авторы:
Boroyev Roman Nikolaevich, Du A., Solovyev Stepan Ivanovich, Xu W.-Y., Chen G.-X., Velichko Vitaly Andreevich
Заглавие: Influence of IMF by on the location of western electrojets during the magnetic storm on Nov. 9-10, 2004

Количество страниц: 4 с.

The spatial-temporal distribution of westward electrojets in the northern hemisphere has been investigated using geomagnetic ground observation data for November 9-10, 2004 geomagnetic storm. It is shown that the location of the maximum westward electrojet depends on the IMF orientation. It is in the evening or morning sector when Bγ0. With the increase of positive IMF Bγ, the region of intensity maximum shifts to morning hours. Thus, the azimuthal IMF component not only controls the pattern of magnetospheric convection, but also affects the longitudinal location of the westward electrojet pattern during the magnetic storm.

Influence of IMF by on the location of western electrojets during the magnetic storm on Nov. 9-10, 2004 / R. N. Boroev, A. Du, S. I. Solovyev, W.-Y. Xu, G.-X. Chen, V. A. Velichko // Physics of auroral phenomena : proceedings of the 29th annual seminar, Apatity, 27 February–3 March 2006. – 2007. – P. 21-24.

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39.
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Авторы:
Tarabukina Lena Dmitrievna, Kozlov Valeriy Ignatevich
Заглавие: Spatial and temporal distribution of lightning strokes over North Asia and its comparison with solar activity variations in 2009-2016
Пространственно-временное распределение грозовых разрядов по территории северного региона Азии и его сравнение с солнечной активностью в 2009-2016 гг.

Количество страниц: 5 с.

В течение 2009-2016 гг. на территории с границами 40-80° N, 60-180° E проанализированы вариации грозовой активности, представленной количеством грозовых разрядов по данным Всемирной грозолокационной сети WWLLN. Выделены две области с повышенным уровнем грозовой активности: западный очаг (48-60° N и 60-90° E), восточный очаг (40-55° N и 110-140° E). Плотность грозовых разрядов в этих областях в 10-100 раз превышает плотность разрядов на окружающих территориях. Сравнение вариаций суточного количества грозовых разрядов и потока радиоизлучения Солнца на волне 10.7 см показало слабую линейную корреляцию между ними: коэффициент корреляции от -0.55 до 0.86 для западного региона и от -0.78 до 0.39 для восточного за все летние сезоны. На возрастающей ветви 24-го солнечного цикла происходит пространственное перераспределение количества грозовых разрядов между восточным и западным регионами высокой грозовой активности. В максимумах солнечного цикла и на его спадающей ветви перераспределения становятся не настолько ярко выраженными как во время возрастающей ветви.
We analyze variations of lightning activity presented by the lightning stroke number obtained by the World Wide Lightning Location Network (WWLLN) within the territory with boundaries 40-80° N and 60-180° E in 2009-2016. There are two regions with high lightning activity: western (48-60° N, 60-90° E) and eastern (40-55° N, 110-140° E). The lightning stroke density in these regions is 10-100 times higher than that in surrounding areas. The comparison between daily variations of lightning stroke number and the 10.7 cm solar radio flux shows no correlation: the linear correlation coefficient varied from -0.55 to 0.86 in the western region and from -0.78 to 0.39 in the eastern region during all summer seasons. During the ascending phase of solar cycle 24, there was a spatial lightning redistribution between the western and eastern regions of high lightning activity. During peaks of the solar cycle and its descending phase, the redistribution was not so pronounced as that during the ascending phase.

Tarabukina, L. D. Spatial and temporal distribution of lightning strokes over North Asia and its comparison with solar activity variations in 2009-2016 = Пространственно-временное распределение грозовых разрядов по территории северного региона Азии и его сравнение с солнечной активностью в 2009-2016 гг. / L. D. Tarabukina, V. I. Kozlov // Солнечно-земная физика = Solar-Terrestrial Physics. – 2017. – Т. 3, N 2 : 13-я российско-китайская конференция по космической погоде. – С. 70-74.
DOI: 10.12737/22602

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40.
Обложка
Авторы:
Solovyev Stepan Ivanovich, Boroyev Roman Nikolaevich, Moiseyev Aleksey Vladimirovich
Заглавие: On the relation between the SYM-H and Dst- indices during the development of magnetic storm

Количество страниц: 4 с.

The Dst-index obtained by hourly average values of the magnetic field at four stations located in various longitudinal sectors at latitudes Φ′≈20-30° is the index of magnetic field depression at low latitudes during the magnetic storm periods. Recently for the characteristics of magnetic field depression the SYM-H index has been used. It is obtained from 1 min data of the magnetic field at ~10 stations, located mainly at latitudes Φ′≈40-50° [1]. It is considered in [2-4] that the SYM-H index is an analog of Dst but with a better temporal resolution. As shown in [5], during super magnetic storms with Dst variation ≥ 400 nT, the SYM-H variations can considerably differ from Dst behavior and thus the SYM-H index is not always an analog of Dst. In this paper the relation between the Dst and SYM-H variations for magnetic storms of different intensity, with Dst varying from ~ -50 nT to -450 nT is investigated.

Solovyev, S. I. On the relation between the SYM-H and Dst- indices during the development of magnetic storm / S. I. Solovyev, R. N. Boroyev, A. V. Moiseyev // Physics of auroral phenomena : proceedings of the 28 th annual seminar, 1-4 March 2005. – 2005. – P. 48-51.

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