Physics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9811339c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A7, p. 11,339-11,347.
Physics
30
Earth Magnetosphere, Geomagnetism, Lines Of Force, Magnetohydrodynamic Waves, Plasma Resonance, Cold Plasmas, Geomagnetic Pulsations, Resonant Frequencies
Scientific paper
The linearized ideal MHD equations are cast into a set of global differential equations from which the field line resonance equations of the shear Alfven waves and slow magnetosonic waves are obtained naturally for finite beta plasmas in general magnetic field geometries with flux surfaces. The coupling between the shear Alfven waves and the magnetosonic waves is through the combined effects of geodesic magnetic field curvature and plasma pressure. For axisymmetric magnetospheric equilibria there is no coupling between the shear Alfven waves and the slow magnetosonic waves because the geodesic magnetic field curvature vanishes. We derive the asymptotic singular solutions of the MHD equations near the field line resonant surface. We perform numerical solutions of the field line resonance equations for a dipole magnetic field with constant plasma pressure and density along the magnetic field line.
Chang Tzu-Ching
Cheng C. Z.
Lin Charles A.
Tsai Wei-Hsiung
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