Collisional/resonance absorption in cold/warm magnetized plasmas of the F-region high-latitude ionosphere
Article first published online: 20 MAY 2009
Copyright 2009 by the American Geophysical Union.
Geophysical Research Letters
Volume 36, Issue 10, May 2009
How to Cite
2009), Collisional/resonance absorption in cold/warm magnetized plasmas of the F-region high-latitude ionosphere, Geophys. Res. Lett., 36, L10101, doi:10.1029/2009GL038379., , and (
- Issue published online: 20 MAY 2009
- Article first published online: 20 MAY 2009
- Manuscript Accepted: 10 APR 2009
- Manuscript Received: 26 MAR 2009
- absorption in the F region at high latitudes;
- linear mode conversion;
- full-wave model
 The collisional/resonance absorption due to linear mode conversion of electromagnetic waves into electrostatic/plasma waves is studied in cold/warm magnetized plasmas relevant to the F-region of the high-latitude ionosphere. The absorption coefficient is calculated numerically using a full-wave model for high-frequency waves incident normally/obliquely to the direction of inhomogeneity. The absorption coefficient of collisional cold plasmas is found to be independent of the collision frequency in the small range of incidence angles near the critical angle; whereas, outside this range absorption increases with increasing collisions. In warm collisionless plasmas, the resonance absorption coefficient is shown to be independent of the electron temperature values pertinent to the F-region plasma. We have demonstrated for the first time a strong effect of the external magnetic field arbitrarily oriented in the plane of incidence on the absorption coefficient, which is not pronounced in the limit of weakly magnetized plasmas.