Model for chorus associated electrostatic bursts. Progress report

Technical Report · Thu Jun 30 04:00:00 EDT 1983

OSTI ID:5310644

Grabbe, C L

The linear theory of the generation of electrostatic bursts of noise by electrons trapped in chorus wave packets is developed for a finite temperature electron beam and a Maxwellian electron and ion background. The growth rates determined qualitatively in good agreement with those obtained by previous authors from a more idealized model. Two connected instability mechanisms seem to be occurring: a beam plasma (electron-ion two-stream) instability commonly associated with intensification of the chorus power levels, and a transitional or borderline resistive medium instability commonly associated with chorus hooks. The physical reasons for the two mechanisms is discussed. In the second case electron beams are difficult to identify in the particle data. An expression is obtained for the maximum growth rate in terms of the ratios of the beam and electron thermal velocities to the beam velocity, and of the beam density to plasma density. It is anticipated that this may allow the observed peak in the electrostatic noise spectrum to be used as a diagnostic for the beam characteristics.

• Research Organization: Iowa Univ., Iowa City (USA). Dept. of Physics and Astronomy
• OSTI ID: 5310644
• Report Number(s): AD-A-131868/2
• Country of Publication: United States
• Language: English

Related Subjects

640201* -- Atmospheric Physics-- Auroral
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BEAM-PLASMA SYSTEMS
BEAMS
DISTRIBUTION FUNCTIONS
EARTH ATMOSPHERE
ELECTRON BEAMS
ELECTROSTATICS
FUNCTIONS
ION BEAMS
IONOSPHERE
LEPTON BEAMS
NOISE
PARTICLE BEAMS
PLANETARY IONOSPHERES
WAVE PACKETS