The Stress Tensor in the Current Sheet and the MHD Closure

Details The Stress Tensor in the Current Sheet and the MHD Closure The Stress Tensor in the Current Sheet and the MHD Closure

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsm43a..07d&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SM43A-07

Physics

2744 Magnetotail, 2764 Plasma Sheet

Scientific paper

MHD closure of the moment equations neglects divergence of the off-diagonal elements of the stress tensor, Π, as well as the divergence of the heat flux ∇ q. In the center of the plasma sheet the local ion gyroradius becomes large, and q and Π become important components of the current sheet energy and momentum balance. Particle simulations have been used to calculate the contribution of the off-diagonal elements of the stress tensor to the current sheet force balance using a time dependent tearing mode model. The simulations have a large enough number of particles to calculate higher order moments reliably. Results show that force balance in the current sheet can be dominated by the off-diagonal elements of the stress tensor which are neglected by the MHD closure.

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