Electron-acoustic and cyclotron-sound instabilities driven by field-aligned hot-electron streaming

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

DOI:https://doi.org/10.1029/92JA02900· OSTI ID:6463819

Mace, R L; Hellberg, M A ^[1]

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1. Univ. of Natal (South Africa)

The authors study the magnetized electron-acoustic instability in a three component plasma system, consisting of cool ions, cool electrons, and a hot, drifting electron component. This work looks at the problem in regions of weak, intermediate and strong magnetization, whereas previous work has usually been limited to regions of strong magnetization. In the weak to intermediate region the authors identify an electron-cyclotron-sound instability, with a lower threshold and faster growth rate than the electron-acoustic instability under the same conditions, for wave propagation quasi parallel to the ambient magnetic field. The authors then discuss the relationships of these two instabilities. They couple in the weak field region, but this coupling weakens rapidly with increasing field strength. Implications of this work for auroral hiss and broadband noise in the auroral magnetosphere are also discussed.

• OSTI ID: 6463819
• 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
AURORAE
AURORAL HISS
CHARGED PARTICLES
COUPLING
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
INSTABILITY
IONS
LEPTONS
MAGNETIZATION
MATHEMATICAL MODELS
NOISE
PLASMA
PLASMA INSTABILITY
RADIATIONS
WAVE PROPAGATION