Ballooning instability and structure of diamagnetic hydromagnetic waves in a model magnetosphere

Details Ballooning instability and structure of diamagnetic hydromagnetic waves in a model magnetosphere Ballooning instability and structure of diamagnetic hydromagnetic waves in a model magnetosphere

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9415231m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Nov. 1, 1989, p. 15231-15242. Research supported by the Toray Science

Physics

58

Ballooning Modes, Diamagnetism, Earth Magnetosphere, Geomagnetic Tail, Magnetohydrodynamic Stability, Magnetohydrodynamic Waves, Mathematical Models, Differential Equations, Eigenvalues, Eigenvectors, Magnetic Field Configurations, Magnetic Storms, Ring Currents

Scientific paper

Results of an eigenmode analysis of the ballooning instability of an Alfven wave and a diamagnetic drift-Alfven wave in a finite-Beta model magnetosphere are discussed with a view to investigating the stability of the tail plasma sheet and the excitation mechanism of storm time Pc pulsations. A curved magnetic field line is obtained from a self-consistent model of magnetic field and plasma pressure distributions, constructed on the basis of a two-dimensional equilibrium model of the tail plasma sheet. An eigenmode equation is solved along the field line in order to obtain the eigenfrequency and eigenmode structure of the ballooning instability of the Alfven and the drift-Alfven waves. The stability and characteristics of the low-frequency eigenmode in the finite-Beta model magnetosphere are investigated.

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