Physics
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.5855m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A4, p. 5855-5863.
Physics
8
Cyclotron Resonance Devices, Electron Plasma, Gyrofrequency, Masers, Plasma Temperature, Polarization (Waves), Distribution Functions, Electron Energy, Ion Temperature
Scientific paper
Maser cyclotron instability is studied in the case of interaction between a weakly relativistic hot loss-cone-like component and a cold-cool plasma, for a wide range of parameters applying to natural or artificial beam-plasma phenomena focusing on the relativistic mode lying just below the electron gyrofrequency. The semirelativistic dispersion relation is numerically solved in a number of cases, showing that the relativistic mode is much more easily excited than the usual upper X mode, and that it generally retains the highest extraordinary mode growth rate. This mode is therefore expected to prevail, at least locally, in the source region. The width of the instability range is mostly determined by the ratio nhot/ncold, which must typically lie between 1 and 100. When n(hot)/n(cold) of less than 10, T(cold) must be smaller than 0.2 T(hot). Specific signatures of modes and implications for auroral kilometric radiation are derived.
Béghin Christian
Krasnosel'skikh V. V.
Mourenas D.
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