Physics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.5819v&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, April 1, 1991, p. 5819-5824.
Physics
Cyclotron Resonance, Ionospheric Heating, Magnetohydrodynamic Waves, Plasma Density, Plasma Resonance, Differential Equations, Electromagnetic Radiation, Energy Transfer, Geomagnetism, Wave Equations
Scientific paper
The mode conversion of ordinary polarized electromagnetic waves into electrostatic cyclotron waves in the inhomogeneous ionospheric plasma is investigated. Near resonance the warm plasma dispersion relation is a function of the angle theta between the geomagnetic field and the density gradient and of the wave frequency omega, which lies between the electron cyclotron frequency and its doubling. The differential equations describing the electric field amplitudes near the plasma resonance are studied, including damping at the second gyroharmonic. The energy transmission coefficients and power absorbed by the cyclotron waves are calculated. The vertical penetration of the plasma wave amplitudes is estimated using a WKB analysis of the wave equation.
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