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Документы 241 - 250 из 276
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241.
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Авторы:
Solovyev Stepan Ivanovich, Moiseyev Aleksey Vladimirovich, Yumoto Kiyohumi, Engebretson Mark
Заглавие: Magnetosphere-ionosphere response to magnetosphere compression by the solar wind

Количество страниц: 4 с.

Analysis of the global magnetosphere-ionosphere response to solar wind dynamic pressure variations under the negative IMF Bz has been performed. It is shown that an increase in the dynamic pressure leads to a double response of the ionospheric currents and aurora, i.e. simultaneously (within the accuracy of 1 min) and ~5-7 min afterward. Thereby, the eastward and westward convective electrojets are enhanced in the evening and morning sectors respectively, followed by the intensification of the westward current in the near midnight and evening sectors. The intensification of the electrojets is followed by extension of the diffuse precipitation zone and its high latitude boundary movement to the pole and to the east in the midnight-to-morning sector. In our case, no poleward or westward extension of aurora before midnight is observed. The disturbance triggered by a dynamic pressure increase may be considered as a convection disturbance associated with reconstruction of the DP2 current system.

Magnetosphere-ionosphere response to magnetosphere compression by the solar wind / S. I. Solovyev, A. V. Moiseyev, K. Yumoto, M. Engebretson // Physics of auroral phenomena : proceedings of the 26th annual seminar, 25 - 28 February 2003. – 2003. – P. 41-44.

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242.
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Авторы:
Gololobov P. Yu., Krivoshapkin P. A., Krymsky Germogen Filippovich, Grigoryev Vladislav Georgievich, Gerasimova S. K.
Заглавие: Distribution of tensor anisotropy of cosmic rays near the neutral current sheet
Распределение тензорной анизотропии космических лучей в окрестности токового слоя

Количество страниц: 4 с.

Исследуется временной профиль изотропной интенсивности, компонент векторной и тензорной анизотропии космических лучей (КЛ) в периоды пересечений Землей нейтральной поверхности межпланетного магнитного поля (ММП) в 23-24 циклах солнечной активности. Для определения момента пересечения используется синоптическая карта обсерватории Вилкокса и данные о напряженности ММП. Из дальнейшего анализа исключены периоды Форбуш понижений и наземных возрастаний солнечных КЛ. События анализируются для эпох с положительной и отрицательной полярностями общего магнитного поля Солнца. А также внутри каждой эпохи отдельно выделены переходы от сектора с положительным знаком к сектору с отрицательным знаком и, наоборот, переход от отрицательного знака к положительному. Всего отобрано 213 событий пересечений. Для каждого события с помощью метода глобальной съемки были получены первые две сферические гармоники углового распределения КЛ. Среднее число станций, данные которых использованы в каждом событии, составило в среднем 32. В результате анализа данных полученных вышеуказанными методами показано, что временное изменение изотропной компоненты вызвано возникновением магнитной пробки. Впервые надежно выделены зональные гармоники, доказано существование в области малой энергии антисимметричной суточной вариации КЛ, ориентированной вдоль ММП. Приведено сравнение с ранее полученными результатами.
We analyze time profiles of isotropic intensity, components of vector and tensor anisotropies of cosmic rays (CR) when Earth crosses the neutral sheet of the interplanetary magnetic field (IMF) in solar activity cycles 23-24. The moments of the crossings are determined from Wilcox Observatory synoptic charts and IMF data. Periods of Forbush decreases and ground level enhancements are excluded from the analysis. The events are analyzed for the epochs of positive and negative signs of the Sun’s general magnetic field. During each epoch, the crossings from the positive sector to the negative one and vice versa are separated. In total, 213 crossing events have been selected. The first two spherical harmonics of the angular CR-distribution are obtained using the global survey method. In each case, the average number of stations is equal to 32. The analysis shows that the temporal change of the isotropic component is caused by a magnetic mirror. For the first time, the zonal harmonics are reliably distinguished, and the existence of the antisymmetric diurnal CR-variation in a low energy range, which is oriented along IMF, is recognized. We compare our results with those obtained earlier.

Distribution of tensor anisotropy of cosmic rays near the neutral current sheet = Распределение тензорной анизотропии космических лучей в окрестности токового слоя / P. Yu. Gololobov, P. A. Krivoshapkin, G. F. Krymsky, V.G. Grigoryev, S. K. Gerasimova // Солнечно-земная физика = Solar-Terrestrial Physics. – 2017, т. 3, N 2 : 13-я российско-китайская конференция по космической погоде. – С. 18-21.
DOI: 10.12737/22603

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243.
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Авторы:
Gololobov P. Yu., Krivoshapkin P. A., Krymsky Germogen Filippovich, Grigoryev Vladislav Georgievich, Gerasimova S. K.
Заглавие: Investigating tensor anisotropy of cosmic rays during large-scale solar wind disturbances
Исследование тензорной анизотропии космических лучей во время крупномасштабных возмущений солнечного ветра

Количество страниц: 5 с.

Впервые произведено разложение наблюдаемой анизотропии космических лучей на зональные гармоники и компоненты векторной и тензорной анизотропии. Рассмотрены события форбуш-понижений космических лучей, произошедших в ноябре 2001 г и ноябре 2004 г. Показано, что в начале форбуш-понижения преобладает конвекционный ток космических лучей, направленный от Солнца, а в период восстановления интенсивности - диффузионный ток частиц вдоль межпланетного магнитного поля в сторону Солнца. На фазах спада интенсивности космических лучей наблюдается кратковременное уменьшение величины второй зональной гармоники, которое совпадает с резкими скачками напряженности межпланетного магнитного поля и скорости солнечного ветра. Во время прохождения крупномасштабных возмущений солнечного ветра тензорная анизотропия ведет себя сложным образом, для объяснения ее поведения требуется дальнейшее детальное исследование.
The observable anisotropy of cosmic rays has first been decomposed into zonal harmonics and components of vector and tensor anisotropy. We examine Forbush decreases in cosmic rays that occurred in November 2001 and November 2004. It is shown that at the beginning of a Forbush decrease an antisunward convective current of cosmic rays predominates; and during the recovery phase, a sunward diffusive current of particles along the interplanetary magnetic field dominates. During the phase of intensity drop, short-time decreases in the second zonal harmonic take place. These decreases occur with abrupt changes of the interplanetary magnetic field intensity and solar wind speed. During the passage of large-scale solar wind disturbances, the tensor anisotropy behaves in a complicated way. To explain its behavior, a further detailed investigation is required.

Investigating tensor anisotropy of cosmic rays during large-scale solar wind disturbances = Исследование тензорной анизотропии космических лучей во время крупномасштабных возмущений солнечного ветра / P. Yu. Gololobov, P. A. Krivoshapkin, G. F. Krymsky, V. G. Grigoryev, S. K. Gerasimova // Солнечно-земная физика = Solar-Terrestrial Physics. – 2017, т. 3, N 2 : 13-я российско-китайская конференция по космической погоде. – С. 22-26.
DOI: 10.12737/22604

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244.
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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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245.
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Авторы:
Skryabin Nikolay Georgievich, Samsonov Sergey Nikolaevich, Plotnikov Igor Yakovlevich
Заглавие: Influence of a change in solar magnetic field polarity on the Jovian electron flux intensity

Количество страниц: 3 с.

The Jupiter is a powerful regular source of high-energy electrons (0,2-40 MeV). In this connection their density in the near-Earth space systematically increases with a period of 399 days, which is coincident with the synodic period of Jupiter. According to our estimations, their energy is sufficient to produce a significant local reduction of the magnetic field in the IMF sector connected with the Jupiter. In this paper the evidence is presented that the electron fluxes in the Jovian sector are controlled by the general magnetic field of the Sun. A treatment of 399-day intervals of the electron fluxes and IMF, obtained from spacecraft data for the period of 1963 to 2000 has been performed by superposed epoch technique taking into account the periodic change of the solar magnetic field polarity. Having adopted the Jupiter opposition day to be an epoch zero, the changes in particle intensity and IMF components under different signs of the general magnetic field of the Sun are found by using a large dataset (9925 days). The times of 399-day variation maxima in different periods of solar activity are compared and a character of their displacement relative to Jupiter opposition momentsis discussed.

Skryabin, N. G. Influence of a change in solar magnetic field polarity on the Jovian electron flux intensity / N. G. Skryabin, S. N. Samsonov, I. Ya. Plotnikov // Physics of auroral phenomena : proceedings of the 26th annual seminar, 25 - 28 February 2003. – 2003. – P. 159-161.

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246.
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Авторы:
Boroyev Roman Nikolaevich, Gelberg Mikhail Germanovich
Заглавие: Dependence of longitudinal localization of substorm center on geosynchronous orbits on the IMF Bγ-component

Количество страниц: 4 с.

The dependence of the longitudinal substorm center localisation on geosynchronous orbits on the IMF Bγ-component has been studied. It is shown that the local magnetic time of the longitudinal substorm center localisation in the magnetosphere varies from evening hours to morning hours as the Bγ-component increases. At low solar wind speeds the substorm centers localize nearer to the evening sector. The ionospheric projection of the substorm center magnetospheric localisation shifts westward at By0. Maximum longitudinal shifts of substorm centers in the ionosphere relative to their location in the magnetosphere are - 3.5 h at Bγ=-4 nT and 3.5 h at Bγ=4.4 nT. Thus, the change of the substorm center localisation relative to the midnight in the ionosphere is caused by both the change of the substorm center position in the magnetosphere and a turn of the magnetotail relative to X-axis.

Boroyev, R. N. Dependence of longitudinal localization of substorm center on geosynchronous orbits on the IMF Bγ-component / R. N. Boroyev, M. G. Gelberg // Proceedings of the Fifth International Conference on Substorms : 16-20 May 2000 Congress Centre of the Arctic and Antarctic Research Institute, St. Petersburg, Russia. − Noordwijk, Netherlands : European Space Agency, 2000. − P. 41-44.

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247.
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Автор:
Boroyev Roman Nikolaevich
Заглавие: Dynamics of the field-aligned current during substorms with a sharp onset of the expansion phase

Количество страниц: 4 с.

By using satellite magnetic field measurements it is shown that before the substorm expansion phase onset the field-aligned currents of zone 2 type are not always observed on the geosynchronous orbits at the midnight sector. The relationship between the appearance of the field-aligned currents of zone 2 types before the beginning of the substorm expansion phase and the active phase duration and the preceding magnetic disturbance level has been found. It is found that if the expansion phase lasts less than 11 min, the appearance probability of the field-aligned current of zone 2 type before the substorm expansion phase onset T0 decreases. As the geomagnetic activity rises before a substorm, the probability of the beginning of the field-aligned currents before T0 increases. These results indicate that substorms in which the field-aligned currents of zone 2 type the T0 onset are absent, can be probably developed in the distant part of the magnetotail.

Boroyev, R. N. Dynamics of the field-aligned current during substorms with a sharp onset of the expansion phase / R. N. Boroyev // Proceedings of the Fifth International Conference on Substorms : 16-20 May 2000 Congress Centre of the Arctic and Antarctic Research Institute, St. Petersburg, Russia. − Noordwijk, Netherlands : European Space Agency, 2000. − P. 377-380.

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248.
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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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249.
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Авторы:
Sokolov Vasiliy Dmitrievich, Samsonov Sergey Nikolaevich
Заглавие: The dynamics of auroral absorption parameters in the 22nd solar activity cycle

Количество страниц: 3 с.

Examination of auroral absorption (AA) occurrence rate and AA meridional distribution versus local time and in the course of the solar cycle has been performed by riometer observations from 1985 to 1995 at the longitude of Yakutsk. Geomagnetic latitude of the region of absorption maximum occurrence changes in the course of the solar cycle from 66.5° to 64.4°. The largest displacement of this region to lower latitudes is observed during years of maximum solar activity. The half-width of the region is ~8° at solar minimum and ~10° at solar maximum. It has been also revealed that the region of AA is shifted to higher latitudes at daytime (1000-1400LT), and to lower ones in the evening (1800-2000LT), the displacement from the daily average position being ~1° and ~3° in the years of solar activity maximum and minimum, respectively. In all years at 2000-2100LT a short-term extension of the AA region by 1-4° is observed. The interpretation of the observationa is proposed.

Sokolov, V. D. The dynamics of auroral absorption parameters in the 22nd solar activity cycle / V. D. Sokolov, S. N. Samsonov // Physics of auroral phenomena : proceedings of the 26th annual seminar, 25 - 28 February 2003. – 2003. – P. 95-97.

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250.
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Авторы:
Foerster M., Mishin Vilen M., Saifudinova Tamara Ivanovna, Bazarzhapov Alexander Dashitsyrenovich, Sapronova Lyudmila Alexandrovna, Golovkov Vadim Petrovich, Stauning P., Watermann J., Solovyev Stepan Ivanovich
Заглавие: Dynamics of the Ionospheric Convection Systems Observed during The Super-Storm on Nov. 20, 2003

Количество страниц: 3 с.

In the accompanying Papers 1 and 2 was fulfilled timing of the 20.11.05 super-storm. Were detected 4 various types of the magnetospheric disturbances observable at southward IMF, and presented a new model of the field-aligned currents density spatial distribution in the polar ionosphere. In this paper are described the ionospheric convection systems, characteristic for the above various types. Are mentioned the mesoscale spatial inhomogeneities, which are observed more or less regularly but have not been mentioned in the past literature.

Dynamics of the Ionospheric Convection Systems Observed during The Super-Storm on Nov. 20, 2003 / M. Foerster, V. M. Mishin, T. I. Saifudinova, A. D. Bazarzhapov, L. A. Sapronova, V. P. Golovkov, P. Stauning, J. Watermann, and S. I. Solovyev // Solar Extreme Events Fundamental Science and Applied Aspects Nor-Amberd, Armenia 26-30 September 2005 : proceedings of the Second International Symposium / edited by A. Chilingarian and G. Karapetyan. − Erevan : Cosmic Ray Division, Alikhanyan Physics Institute, 2006. − P. 83-85.

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