Physics – Optics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.2225h&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, Nov. 1990, p. 2225-2228.
Physics
Optics
16
Gyrofrequency, Harmonics, Ion Cyclotron Radiation, Magnetic Storms, Oxygen, Plasmapause, Electromagnetic Radiation, Helium, Plasma Waves, Ray Tracing
Scientific paper
A hot ray tracing code (HOTRAY) is used to establish the ultimate demise of the wave energy generated inside the plasmasphere during storm conditions. The code uses the WKB approximation of geometric optics to calculate the paths of electromagnetic and electrostatic waves in a hot, multiion plasma. Ray tracing calculations with HOTRAY are detailed and path integrated absorption is discussed. Unducted waves which are preferentially generated in the field aligned direction are rapidly refracted to large wave normal angles. The waves are observed to reflect at frequencies between oxygen and helium gyrofrequencies once their frequency falls below the bi-ion frequency and the waves bounce back accross the equator. Either Landau resonance with plasmaspheric electrons or second harmonic cyclotron resonance with thermal oxygen ultimately absorb the wave energy. It is suggested that both processes may provide a significant heating mechanism for either population during a storm.
Horne Richard B.
Mansergh Thorne Richard
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