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Proton beam generation of oblique whistler wavesIt is known that ion beams are capable of generating whistler waves that propagate parallel to the mean magnetic field. Such waves may have been observed both upstream of the earth's bow shock and in the vicinity of comets. Previous analyses are extended to include propagation oblique to the mean magnetic field. The instability is generated by the perpendicular component of free energy in the ions, which can arise either via a temperature anisotropy or via a gyrating distribution. In the former case, the generation of whistler waves is confined to a fairly narrow cone of propagation directions centered about parallel propagation; in the latter case, the maximum growth of the instability can occur at fairly large obliquities (theta equal to about 50 deg).
Document ID
19880048542
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Wong, H. K.
(Southwest Research Institute San Antonio, TX, United States)
Goldstein, M. L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 13, 2013
Publication Date
May 1, 1988
Publication Information
Publication: Journal of Geophysical Research
Volume: 93
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
88A35769
Funding Number(s)
CONTRACT_GRANT: NSF ATM-87-13225
CONTRACT_GRANT: NSF ATM-84-05536
Distribution Limits
Public
Copyright
Other

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