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Title:
Cyclotron maser emission of auroral Z mode radiation
Authors:
MELROSE, D. B.; HEWITT, R. G.; DULK, G. A.
Affiliation:
AA(Sydney, University, Sydney, Australia)
Journal:
Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Dec. 1, 1983, p. 10065-10071.
Publication Date:
12/1983
Category:
Geophysics
Origin:
STI
NASA/STI Keywords:
AURORAL IRRADIATION, CYCLOTRON RADIATION, MASER OUTPUTS, PLASMA FREQUENCIES, RADIATION DISTRIBUTION, CYCLOTRON RESONANCE, ELECTRON CYCLOTRON HEATING, GROUP VELOCITY, KINEMATICS, PROPAGATION MODES
Bibliographic Code:
1983JGR....8810065M

Abstract

Results are presented suggesting that loss cone driven cyclotron maser emission by upgoing electrons, closely analogous to auroral kilometric radiation (AKR), may be the mechanism behind the observed Z mode radiation. With this hypothesis, the lack of a strong correlation between the Z mode radiation and AKR is not surprising; the ray paths for the X mode and the Z mode are markedly different, with the former directed upward and the latter downward. In addition, it is expected that the generation of the Z mode will be favored only in regions where the ratio of the plasma frequency to the electron cyclotron frequency is greater than or approximately equal to 0.3, that is, where the X mode radiation is suppressed. If the fraction of the radiation generated that crosses the cyclotron layer is large, then the argument in favor of the loss cone driven cyclotron maser as the source of the observed Z mode radiation is a strong one. The spatial growth rates are fairly large in comparison with those for the X mode, and there seems to be little doubt that Z mode radiation should be generated under conditions that differ only slightly from those for the generation of X mode radiation in AKR.

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