MHD MODELING OF MAGNETOTAIL INSTABILITY FOR ANISOTROPIC PRESSURE

被引:33
作者
HESSE, M [1 ]
BIRN, J [1 ]
机构
[1] LOS ALAMOS NATL LAB, SPACE PLASMA PHYS GRP, LOS ALAMOS, NM 87545 USA
关键词
D O I
10.1029/92JA00793
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Results of three-dimensional MHD simulations of magnetotail dynamics with anisotropic pressure are presented. The pressure tensor is assumed to be gyrotropic, satisfying a modified double adiabatic approximation including Ohmic heating. It is found that these constraints tend to stabilize the tail with respect to the resistive tearing instability. Including an increasing level of additional isotropization results in a gradual transition to the fast instability found in an isotropic model, which is discussed for comparison. Possible isotropization mechanisms yielding magnetotail instability are discussed also. The stabilizing anisotropies are found primarily in the plasma sheet boundary region. This fact indicates a possibly important role of isotropization mechanisms operating in this region in destabilizing the magnetotail and initiating a tearing instability without the necessity of changes in fluctuation levels in the neutral sheet.
引用
收藏
页码:10643 / 10654
页数:12
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