Semirelativistic maser cyclotron instabilities in multicomponent plasmas

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/92JA02788· OSTI ID:6584208

Mourenas, D; Krasnosel'skikh, V V; Beghin, C ^[1]

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1. CNRS, Orleans (France)

The authors study the maser cyclotran instability in the case of interaction of a beam-plasma system. The beam is taken as a weakly relativistic hot loss-cone like component, and the plasma is a cold to cool plasma. They study in particular the relativistic mode which lies just below the electron gyrofrequency. This mode appears to couple to ordinary and Z modes. They solve numerically the semirelativistic dispersion relation for a number of cases, and demonstrate that the relativistic mode is easier to excite than the usual X mode with f>f[sub ce], and study its growth rate. Because the relativistic mode has a large growth rate it is expected to be the dominant mode, at least locally in the source region. The physical extent of the instability region is found to depend upon the ratio of hot to cold plasma density and temperature. Specific applications to the study of auroral phenomena are addressed.

• OSTI ID: 6584208
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 98:A4; ISSN JGREA2; ISSN 0148-0227
• Country of Publication: United States
• Language: English

Related Subjects

661320* -- Auroral
Ionospheric
& Magnetospheric Phenomena-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BEAM-PLASMA SYSTEMS
COLD PLASMA
CYCLOTRON INSTABILITY
ENERGY RANGE
GYROFREQUENCY
INSTABILITY
INSTABILITY GROWTH RATES
LOSS CONE
OSCILLATION MODES
PLASMA
PLASMA DENSITY
PLASMA INSTABILITY
PLASMA MICROINSTABILITIES
RELATIVISTIC RANGE