Nonlinear current sheet formation in ideal plasmas

Details Nonlinear current sheet formation in ideal plasmas Nonlinear current sheet formation in ideal plasmas

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9921241v&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A11, p. 21,241-21,248

Physics

10

Current Sheets, Earth Magnetosphere, Geomagnetic Tail, Magnetic Storms, Magnetohydrodynamics, Plasma Currents, Plasma Equilibrium, Space Plasmas, Magnetic Field Configurations, Mathematical Models, Plasma Density, Plasma Dynamics

Scientific paper

We present a numerical study of the formation of current sheets in ideal plasmas. First we confirm the development of singular current sheets in a one-dimensional model. In a second step we extend the analysis to two-dimensional equilibria. Here it is found that the resulting structures are quiet insensitive to the boundary conditions. For the special case of a magnetotail like equilibrium it will be shown that the resulting current distribution provides a possibility to understand the onset of a localized anomalous resistivity from a macroscopic point of view. Furthermore, the resulting structures provide an explanation for the dramatic decrease of the thickness of the current sheet in the magnetotail prior to the onset of geomagnetic substorms.

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