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MHD modeling of magnetotail instability for anisotropic pressure

Hesse, Michael ; Birn, Joachim

Journal of Geophysical Research, 1992-07, Vol.97 (A7), p.10643-10654 [Periódico revisado por pares]

Legacy CDMS: Blackwell Publishing Ltd

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Título:
MHD modeling of magnetotail instability for anisotropic pressure
Autor: Hesse, Michael ; Birn, Joachim
Assuntos: 661320 - Auroral, Ionospheric, & Magnetospheric Phenomena- (1992-) ; Astronomy & Astrophysics ; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ; COMPARATIVE EVALUATIONS ; COMPUTERIZED SIMULATION ; EARTH ATMOSPHERE ; EARTH MAGNETOSPHERE ; EVALUATION ; FLUID MECHANICS ; Geophysics ; HEATING ; HYDRODYNAMICS ; INSTABILITY ; MAGNETOHYDRODYNAMICS ; MAGNETOTAIL ; MATHEMATICAL MODELS ; MECHANICS ; Physical Sciences ; PLASMA HEATING ; PLASMA INSTABILITY ; PLASMA MACROINSTABILITIES ; PLASMA PRESSURE ; PLASMA SHEET ; Science & Technology ; SIMULATION ; STABILITY ; TEARING INSTABILITY ; THREE-DIMENSIONAL CALCULATIONS ; TIME DEPENDENCE
É parte de: Journal of Geophysical Research, 1992-07, Vol.97 (A7), p.10643-10654
Notas: ArticleID:92JA00793
istex:097807E817946CAA73C95922D4C6FA926BF74569
ark:/67375/WNG-D2MT8FRQ-J
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Descrição: 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.
Editor: Legacy CDMS: Blackwell Publishing Ltd
Idioma: Inglês

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MHD modeling of magnetotail instability for anisotropic pressure

Hesse, Michael ; Birn, Joachim

Legacy CDMS: Blackwell Publishing Ltd

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