Multilayer structure of thin current sheets in the Earth's magnetotail: The role of ionospheric ions

Details Multilayer structure of thin current sheets in the Earth's magnetotail: The role of ionospheric ions Multilayer structure of thin current sheets in the Earth's magnetotail: The role of ionospheric ions

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm23b0434z&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM23B-0434

Other

2744 Magnetotail, 2764 Plasma Sheet, 2788 Magnetic Storms And Substorms (7954), 7827 Kinetic And Mhd Theory, 7835 Magnetic Reconnection (2723, 7526)

Scientific paper

Thin current sheets (TCS) represent one of the critical regions in the Earth's magnetosphere where magnetic energy accumulate and is subsequently released. Self-consistent analytical models of multi-component TCS have been developed by considering quasi-adiabatic approximation. In these equilibria the tension of magnetic field lines is balanced by the ion inertia, rather than the plasma pressure gradient. The influence of the electron population is taken into account assuming Boltzman- like equilibrium distribution in the ambipolar electrostatic field. The electrostatic effects can lead to new and interesting features of the current density profile inside the TCS, for example, to their splitting. Another effect is a very strong steepening of the TCS magnetic field profile in the very center of the configuration. The presence of oxygen ions leads to a contribution of less than 25 percent (for realistic magnetotail conditions) of the net cross- current, but the current "wings" carried by O+ ions produce very noticeable thickening of the current profile. The dependencies of these effects on the electron and oxygen temperatures, the relative density of O+ ions and the curvature of magnetic field lines are analyzed. The implications of these effects for the problems of substorm triggering and particle acceleration are also investigated.

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