Physics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9714929l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A10, p. 14,929-14,946.
Physics
5
Energy Absorption, Ionospheric Heating, Magnetohydrodynamic Waves, Oxygen Ions, Plasma Resonance, Wave-Particle Interactions, Conics, Coupled Modes, Ion Cyclotron Radiation, Polar Cusps
Scientific paper
The present analysis demonstrates the likelihood that oxygen ions are heated transversely by the large-amplitude Alfvenic fluctuations related to downgoing waves. Alfven waves propagating earthward through a multicomponent plasma are shown to be mode-converted by the inhomogeneous geomagnetic field into O(+) cyclotron waves leading to transverse resonant heating of the O(+) ions. The absorption coefficient at the O(+) gyrofrequency range is studied in the context of the cold-plasma approximation, and two types of downgoing waves are found to play a role in the absorption process. Critical parameters for this process are identified, and comparisons are made to the Viking and DE-1 experimental data. The optimized conditions for oxygen-ion heating are found to be satisfied in the region where the Alfvenic turbulence is accompanied by conics.
Le Queau Dominique
Roux Alain
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