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Antisunward structure of thin current sheets in the Earth's magnetotail: implications of quasi-adiabatic theoryстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 декабря 2013 г.
- Авторы: Malova H.V., Popov V.Yu, Delcourt D.C., Petrukovich A.A., Zelenyi L.M.
- Журнал: Journal of Geophysical Research
- Том: 118
- Номер: 7
- Год издания: 2013
- Издательство: William Byrd Press for John Hopkins Press
- Местоположение издательства: United States
- Первая страница: 4308
- Последняя страница: 4318
- DOI: 10.1002/jgra.50390
- Аннотация: We developed a self-consistent kinetic model of thin current sheets (TCS) taking into account the inhomogeneity of TCS parameters in the antisunward direction. We show that the charged particle dynamics depending on the magnetic field distribution in the downtail direction completely determines the magnetotail equilibrium structure. We demonstrate that transient ions as well as electrons are the main current carriers in this system, but the first ones support mostly the background (1D) structure of the current sheet. The influence of electrons and quasi-trapped ions is found to vary depending upon downtail distance along the sheet. Assuming the conservation of the so-called "quasi-adiabatic invariant", we show that quasi-trapped particles are distributed along the current sheet in such a way that they concentrate in the region with large values of normal magnetic field component. As a result quasi-trapped ions can dominate near the earthward edge of TCS. In contrast, the electron current becomes stronger in the TCS tailward region where the normal magnetic field component becomes weaker and field line curvature drifts are enhanced. Our quasi-adiabatic model predicts that thin current sheets in the Earth’s magnetotail should have weakly 2D configuration which, similarly to its 1D analog considered earlier, conserves the multi-scale “matreshka” structure with multiple embedded layers.
- Добавил в систему: Малова Хельми Витальевна