Physics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.2628l&link_type=abstract
Journal of Geophysical Research, vol. 83, June 1, 1978, p. 2628-2636.
Physics
9
Compression Waves, Earth Magnetosphere, Magnetohydrodynamic Waves, Plasma Oscillations, Wave Propagation, Anisotropy, Cold Plasmas, Density Distribution, Distribution Functions, High Temperature Plasmas, Magnetic Storms, Maxwell Equation, Polarization (Waves), Vlasov Equations, Wave Dispersion
Scientific paper
The article studies the hydromagnetic wave propagation characteristics in a mixture of cold and hot plasma in the presence of an inhomogeneous magnetic field. Electron and ion distribution functions with a temperature anisotropy and a density gradient are used to obtain the dispersion equation by solving the Vlasov equation and Maxwell equations. From the solutions of the dispersion equation we find that the Alfven waves can couple to unstable drift mirror waves under certain conditions. The polarization of the coupled waves is studied for varying parameters of temperature anisotropy and the cold to hot density ratio. From detailed comparison of the theoretical results with the low-frequency wave properties observed in the magnetosphere we propose that the storm-associated magnetic field oscillations with periods of 100-600 s might be caused by the coupling of Alfven waves and the unstable drift mirror waves.
Lin Chang-Shou
Parks George K.
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