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Интеллектуальная Система Тематического Исследования НАукометрических данных |
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Two magnetospheric response modes to interplanetary shock impactsтезисы доклада
- Авторы: Alexeev I.I., Belenkaya E.S., Kalegaev V.V., Clauer R.C., Weimer D.R.
- Сборник: American Geophysical Union (AGU) Spring Meeting 2009
- Тезисы
- Год издания: 2009
- Первая страница: #SM23A-03
- Аннотация: The normal magnetospheric response to an interplanetary shock is a global compression of the magnetosphere that produces a global increase in the equatorial H component magnetic field. The magnetospheric compression is accompanied by an intensification of the magnetopause currents and their simultaneous movement closer to the Earth. Another, more rare and more complex interaction occurs when the increase in solar wind dynamic pressure associated with the shock is simultaneous with a northward turning of the IMF. In this case, in addition to the magnetospheric compression, the global structure of the outer magnetosphere reconfigures to change the pattern of magnetospheric plasma convection. A characteristic observation during such an atypical response is that the low-latitude ground increase in the H-component is seen only on the night side. Only a small, or sometimes negative, change in H is observed on the day side. We suggest an explanation of these phenomena based upon different time delays of the magnetopause and tail current systems following the shock impact. In response to the northward turning of the IMF, a change in convection on the closed field region begins about 30 minutes following the development of the 4-cell convection system in the open field line region. The development of the reverse convection cells is, in part, supported by a special transition FAC system. A calculation of the magnetic effects due to the total FAC including the transition current system shows good agreement with ground magnetometer measurements.
- Добавил в систему: Беленькая Елена Семеновна