Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm41a1427m&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM41A-1427
Physics
2723 Magnetic Reconnection (7526, 7835), 2744 Magnetotail, 7526 Magnetic Reconnection (2723, 7835), 7835 Magnetic Reconnection (2723, 7526)
Scientific paper
Bifurcated current sheets (BCS) have been observed in both the magnetotail and also within kinetic simulations of magnetic reconnection. The development of a bifurcated current layer may be the direct result of magnetic reconnection or may be due to the nonlinear evolution of the lower-hybrid drift instability. Although the equilibrium theory of these structures has been considered by a number of researchers, the linear stability has not been rigorously treated. In this work, a Vlasov equilibrium is constructed for BCS. This equilibrium is used as the initial condition for linear kinetic theory and kinetic simulations. The strength of this model are 1) By the choice of the parameters, the model can be easily transformed back to the standard Harris equilibrium. 2) One can design the desired profiles of the current structure rather flexibly by varying 6 free parameters. From linear kinetic theory, an approximate dispersion relation and mode structure are obtained for the collisionless tearing mode. The influence of current bifurcation and temperature anisotropy are both examined. Based on these results, corresponding kinetic simulations are performed to test the linear predictions.
Daughton William
Matsui Takafumi
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