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Exploring the solar wind, ed. Marian Lazar, Chapter 18, Turbulence in the magnetosheath and the problem of plasma penetration inside the magnetosphereкнига
- Авторы: Antonova Elozaveta E., Pulinets Maria S., Riazantseva Maria O., Znatkova Svetlana S., Kirpichev Igor P., Stepanova Marina V.
- Год издания: 2012
- Место издания: INTECH Croatia
- Объём: 462 страниц
- ISBN: 978-953-51-0339-4
- Аннотация: Magnetospheric boundary layers are formed due to plasma penetration through the magnetopause. The problem of boundary layer formation is analyzed taking into account the high level of constantly observed magnetosheath turbulence. Magnetic field and plasma measurements onboard the THEMIS satellites were used to study the plasma pressure balance across the magnetopause. Both plasma flows and magnetic field vary significantly in the magnetosheath. Nevertheless, it has been shown, that despite such great variations in the magnetosheath and restrictions to the applicability of MHD approximation in case of the noncollisional plasma, the condition of stress balance is fulfilled with comparatively high accuracy. The amplitudes of magnetic field fluctuations in the magnetospheath are compared to the values of magnetic field inside the magnetosphere at high latitudes. It is shown that magnetic pressure in the magnetosheath is the important factor of magnetopause stress balance at high latitudes. The large-scale change of the distribution of the magnetic field inside the magnetosphere is selected as a probable reason of the change of magnetopause position. Corresponding changes of the magnetopause position leads to reconnection of field line and appearance of magnetosheath plasma inside the magnetosphere. The role of local pressure disbalance in the plasma penetration into the magnetosphere is discussed. The existence of high level of magnetosheath turbulence creates a real obstacle for the theories of the formation of large-scale field-aligned currents and dawn-dusk electric field. We discuss the process of the formation of such currents and fields.
- Добавил в систему: Антонова Елизавета Евгеньевна