Physics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9710643h&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A7, July 1, 1992, p. 10,643-10,654. Research supported by DOE and
Physics
21
Anisotropy, Atmospheric Models, Magnetohydrodynamic Stability, Magnetohydrodynamics, Magnetotails, Neutral Sheets, Adiabatic Conditions, Plasma Sheaths, Tearing Modes (Plasmas), Three Dimensional Models, Time Dependence
Scientific paper
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.
Birn Joachim
Hesse Michael
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