Physics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.1009l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Feb. 1, 1984, p. 1009-1014.
Physics
1
Kilometric Waves, Plasma Waves, Radio Auroras, Space Plasmas, Cold Plasmas, Electron Distribution, Wave Dispersion
Scientific paper
A simple expression is derived for the linear growth rate of R-X mode, auroral kilometric radiation under the assumptions of cold plasma wave dispersion and (omega sub pe)-squared is much less than (Omega sub e)-squared, where omega sub pe and Omega sub e are the electron plasma frequency and gyrofrequency, respectively. The result is valid for all wave normal angles and all frequencies above the right-hand cutoff frequency. With this expression, it is not necessary to evaluate the full dispersion tensor, and variations of the growth rate with plasma parameters are easily obtained. Applying the new expression, it is found that kilometric radiation growth rates are strongly dependent upon the magnitude of the magnetic field-aligned potential difference, and that significant growth of radiation at harmonics of the fundamental is unlikely in regions where (omega sub pe)-squared is much less than (Omega sub e)-squared.
Dusenbery Paul B.
Lyons Larry R.
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