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

We demonstrate that geomagnetically trapped ion-cyclotron waves that are generated near the equator with frequencies below ΩHe+, 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 > 1 keV) with a concentration of no more than 1 or 2%. 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.

Details

Publication status:
Published
Author(s):
Authors: Thorne, R.M., Horne, R.B. ORCIDORCID record for R.B. Horne

On this site: Richard Horne
Date:
1 February, 1993
Journal/Source:
Geophysical Research Letters / 20
Page(s):
317-320
Digital Object Identifier (DOI):
https://doi.org/10.1029/93GL00089