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

Thorne, R.M.; Horne, R.B. ORCID: https://orcid.org/0000-0002-0412-6407. 1993 Cyclotron absorption of ion-cyclotron waves at the bi-ion frequency. Geophysical Research Letters, 20 (4). 317-320. 10.1029/93GL00089

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Official URL: https://doi.org/10.1029/93GL00089

Abstract/Summary

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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1029/93GL00089
ISSN:	00948276
Date made live:	19 Oct 2017 08:17 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/518099

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1029/93GL00089

ISSN:

00948276

Date made live:

19 Oct 2017 08:17 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/518099