Computer Science
Scientific paper
Jan 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973p%26ss...21...67n&link_type=abstract
Planetary and Space Science, Volume 21, Issue 1, p. 67-88.
Computer Science
5
Scientific paper
The work deals with the resonant particle excitation of two electrostatic waves with closely spaced wave numbers, when there is an inhomogeneity present in the form of a spatially dependent wave number. Resonant particle behaviour in such a field is investigated and the resonant particle current is computed for a variety of cases. If the inhomogeneity is such that resonant particles see the wave numbers of the waves increasing, then it turns out that the wave of greatest wave number is preferentially amplified. If the gradient is reversed it is the opposite wave which grows. Thus when a narrow band electrostatic wave is subject to beam excitation, only one of the sideband waves is unstable. The theory is applied to the closely analogous problem of sideband formation in the case of triggering of VLF emissions by magnetospheric whistler pulses, and seems to account for much of the observed behaviour.
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