Physics
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32.1505k&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 32, Dec. 1984, p. 1505-1511.
Physics
15
Earth Magnetosphere, Equatorial Atmosphere, Wave Propagation, Whistlers, Density Distribution, Plasma Density, Propagation Modes, Rarefaction
Scientific paper
An analytical theory of whistler wave propagation in axially symmetric field-aligned density ducts is developed based on a WKB approximation. The theory takes into account both enhancement and rarefactions of density crests and troughs. A series of simple relations between the number of whistler modes n and the angular frequency omega are used to calculate the limiting frequency of wave trapping. The attenuation of whistlers in a density crest due to wave leakage is also analyzed and found to be small for real magnetospheric conditions in the equatorial region. In an analysis of the whistler modes in density troughs for the cases omega less than omega sub c/2 (the angular electron gyrofrequency), omega greater than omega sub c/2, and omega approaches omega sub c/2, it is shown that the number of modes n is of the same order of magnitude in all three cases.
Karpman V. I.
Kaufman R. N.
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