Self-organization in space plasma: formation of magnetic shear in current sheetsтезисы доклада

Дата последнего поиска статьи во внешних источниках: 9 марта 2017 г.

Работа с тезисами доклада


[1] Self-organization in space plasma: formation of magnetic shear in current sheets / Z. Lev, M. Helmi, M. Oleg et al. // 41st COSPAR Scientific Assembly 2016, Istambul, Turkey, 30 July-7. — COSPAR Turkey, Istanbul, 2016. — P. D2.4–0018–16. Thin current sheets are plasma structures that usually appear near reconnection regions. The presence of the shear magnetic field is characteristic for these structures. Self-consistent ki- netic model of magnetotail thin current sheet (TCS) is used to understand the mechanisms of self-organization of sheared thin current sheets in a space plasma. It is shown that these config- urations appear as a result of self-consistent evolution of some initial magnetic perturbation at current sheet center. Two general shapes of shear TCS components are found as a function of the transverse coordinate: symmetric and antisymmetric. We show that TCS formation goes together with the emergence of field-aligned currents in the center of the current sheet, as a result of north-south asymmetry of quasi-adiabatic ion motions. Ion drift currents can also contribute to the magnetic shear evolution, but their role is much less significant, their contri- bution depending upon the normal component Bz and the amplitude of the initial perturbation in TCS. Parametric maps illustrating different types of TCS equilibria are presented.

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