Cyclotron absorption of ion-cyclotron waves at the bi-ion frequency

Details Cyclotron absorption of ion-cyclotron waves at the bi-ion frequency Cyclotron absorption of ion-cyclotron waves at the bi-ion frequency

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..317t&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 4, p. 317-320.

Physics

15

Atmospheric Physics, Cyclotron Frequency, Earth Magnetosphere, Electromagnetic Absorption, Ion Cyclotron Radiation, Cyclotron Resonance, Helium Ions, Magnetic Storms, Oxygen Ions, Ring Currents

Scientific paper

We demonstrate that geomagnetically trapped ion-cyclotron waves that are generated near the equator with frequencies below Omega(He+), can experience significant O(+) cyclotron resonant absorption near the reflection point at frequencies just above the bi-ion frequency. The absorption is strongest when the wave normal angle is highly oblique and when the heavy ions are relatively hot (T greater than 1 keV) with a concentration of no more than 1 or 2 percent. This suggests that wave absorption near the bi-ion frequency could contribute to the heating process for energetic ring current (O+) in the outer radiation zone during geomagnetic storms.

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