Physics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.5677p&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 88, July 1, 1983, p. 5677-5684.
Physics
26
Atmospheric Models, Earth Magnetosphere, Geomagnetic Pulsations, Magnetic Storms, Plasma Drift, Plasma Waves, Cold Plasmas, Magnetohydrodynamic Stability, Plasma Density, Plasma Temperature
Scientific paper
A dispersion relation for the stability of the coupled drift compressional, drift mirror, and shear Alfven waves in the magnetospheric plasma is analyzed by numerical method. The analysis is suitable for the storm time plasma conditions in the magnetosphere which usually has gradients in plasma density, temperature, magnetic field, and anisotropy in temperature. The effect of high beta which is characteristic of storm time plasma is included in the model. For a given appropriate set of plasma parameters, and wave parameters of a mode, relative wave amplitudes are calculated from the model. A comparison is made of model generated and observed relative wave amplitudes by using two sample wave events observed by Explorer 45 during the Aug. 4-6, 1972, magnetic storm. The quantitative analysis shows good agreement between theory and observations for a gradient-driven Alfvenlike instability; however, growth rates are very small for this mode. The anisotropy-driven drift mirror instability has large growth rates but does not show correlation between theory and observations of relative wave amplitudes.
Cahill Laurence J. Jr.
Ng Pun-Hon
Patel Vithal L.
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