Electron-cyclotron maser emission - Relative growth and damping rates for different modes and harmonics

Details Electron-cyclotron maser emission - Relative growth and damping rates for different modes and harmonics Electron-cyclotron maser emission - Relative growth and damping rates for different modes and harmonics

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89..897m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Feb. 1, 1984, p. 897-904.

Physics

110

Atmospherics, Auroral Zones, Electron Cyclotron Heating, Harmonic Generations, Kilometric Waves, Maser Outputs, High Energy Electrons, Modal Response, Rates (Per Time), Wave Attenuation

Scientific paper

The temporal growth rate and the number of e-folding growths are calculated and compared for the following wave modes due to a loss-cone-driven cyclotron maser: fundamental x, o, and z modes and second harmonic x and o modes. The dominant mode of the maser should be the fastest growing mode for a saturated maser and should be the mode with the greatest number of e-folding growths for an unsaturated maser; this mode is the fundamental x mode) for a plasma frequency to cyclotron frequency ratio of less than about 0.3; it is the z mode (or perhaps the fundamental o mode) for ratios between 0.3 and 1.0, and the z mode (or perhaps the second harmonic x mode) for ratios between 1.0 and 1.3. Two main points are made: the dominance of the z mode over the range of ratios considered and the very weak effect of cyclotron damping. Electron-cyclotron maser emission is seen as responsible for auroral kilometric radiation, decametric radio emission from Jupiter and Saturn, solar microwave spike bursts, and microwave emission from some flare stars.

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