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A model for chorus associated electrostatic burstsThe 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 elecron 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. Previously announced in STAR as N84-12832
Document ID
19840040876
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Grabbe, C. L.
(Iowa, University Iowa City, IA, United States)
Date Acquired
August 12, 2013
Publication Date
February 1, 1984
Publication Information
Publication: Journal of Geophysical Research
Volume: 89
ISSN: 0148-0227
Subject Category
Geophysics
Report/Patent Number
AD-A140717
Accession Number
84A23663
Funding Number(s)
CONTRACT_GRANT: NGL-16-001-043
CONTRACT_GRANT: NAGW-364
CONTRACT_GRANT: NAS5-26819
CONTRACT_GRANT: NAS5-26257
Distribution Limits
Public
Copyright
Other

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