The effect of background plasma density on the growth of ordinary and Z mode emissions in the auroral zone

Details The effect of background plasma density on the growth of ordinary and Z mode emissions in the auroral zone The effect of background plasma density on the growth of ordinary and Z mode emissions in the auroral zone

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.6641o&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, July 1, 1985, p. 6641-6646.

Physics

13

Auroral Spectroscopy, Kilometric Waves, Masers, Plasma Density, Cyclotron Resonance, Electron Distribution, Electron Plasma, Gyrofrequency, Plasma Frequencies

Scientific paper

Using an electron distribution function measured in the auroral zone, the growth rates of both ordinary and Z-mode radiation are calculated via the cyclotron maser mechanism. The growth rates of Z-mode radiation are much more sensitive to the background plasma density than those of ordinary mode radiation, which are essentially constant over a wide range of the ratio of the background electron plasma frequency to the gyrofrequency. In very low density regions, Z-mode waves are dominant over the ordinary mode, but as the ratio of the electron plasma frequency over the gyrofrequency increases, the growth rates of Z-mode are substantially reduced, leading to an eventual dominance of the ordinary mode over the Z-mode. A comparison between the growth rates of Z-mode due to the upgoing loss cone electrons and those due to the trapped and 'hole' electrons shows that the presence of trapped and hole electrons can greatly enhance the growth rates.

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