Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm22a..01r&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM22A-01
Physics
2744 Magnetotail, 7835 Magnetic Reconnection, 7843 Numerical Simulation Studies
Scientific paper
We present new and interesting results on the dynamics of a current sheet in the Hall MHD regime. We consider the plasma dynamics in the plane orthogonal to the magnetic field B = B(x,y) ez which reverses direction in y-direction. The initial width of the current sheet is Ly0. We impose an enhanced current profile locally in the system, i.e., the width of the current layer is reduced so that Ly1 < Ly0. When the enhanced current is imposed on the left boundary we show that a shock-like Hall wave propagates through the system. Associated with this penetrating field structure is an enhancement of the magnetic field energy in the system. The energy is carried into the system by the electrons from the right boundary. The incoming magnetic field energy can be dissipated through Joule heating of the plasma and excitation of magnetosonic waves. When the enhanced current is localized in the center of the current sheet we show that the system evolves asymmetrically. The shock-like structure propagates in the B x ∇ n direction. We present both theoretical analysis and numerical simulations of these processes. We discuss the application of this work to magnetotail dynamics. \ Research supported by NASA and ONR
Huba Joseph D.
Rudakov Leonid
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