Ion/ion and electron/ion cross-field instabilities near the lower hybrid frequency

Journal Article · Tue Sep 01 04:00:00 EDT 1987 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/JA092iA09p10029· OSTI ID:5527677

Gary, S P; Tokar, R L; Winske, D ^[1]

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1. Los Alamos National Lab., NM (United States)

Instabilities near the lower hybrid frequency are investigated by numerically solving the linear Vlasov electromagnetic dispersion equation. The configuration is that of two unmagnetized ion components, a less dense beam and a more dense core, streaming across uniform magnetic field with magnetized electrons in the zero momentum frame. All three components are considered to have similar temperatures. This paper studies the parametric dependences of maximum growth rate for three distinct modes: the electron/ion beam modified two-stream instability, the electron/ion core modified two-stream instability, and the ion/ion lower hybrid instability. In the electrostatic limit the electron/beam instability has a lower threshold and larger growth rate than its electron/core counterpart. Except near equal beam and core densities, the authors results also suggest that the electron/beam instability has a maximum growth rate that is equal to or greater than that of the ion/ion instability for all plasma beta values. Thus the electron/beam modified two-stream instability is a likely candidate to account for the presence of lower hybrid fluctuations in the foot of the earth's bow shock at low beta.

• OSTI ID: 5527677
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 92:A9; ISSN JGREA; 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
BETA RATIO
BOLTZMANN-VLASOV EQUATION
CHARGED PARTICLES
COLLISIONLESS PLASMA
CORRELATIONS
DIFFERENTIAL EQUATIONS
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
EQUATIONS
FLUCTUATIONS
INSTABILITY
INSTABILITY GROWTH RATES
INTERACTIONS
ION DRIFT
IONS
NUMERICAL SOLUTION
PARAMETRIC ANALYSIS
PARTIAL DIFFERENTIAL EQUATIONS
PLASMA
PLASMA INSTABILITY
PLASMA MICROINSTABILITIES
REFLECTION
SHOCK WAVES
SOLAR ACTIVITY
SOLAR WIND
TWO-STREAM INSTABILITY
VARIATIONS