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Proton beam generation of whistler waves in the earth's foreshockIt is shown that proton beams, often observed upstream of the earth's bow shock and associated with the generation of low-frequency hydromagnetic fluctuations, are also capable of generating whistler waves. The waves can be excited by an instability driven by two-temperature streaming Maxwellian proton distributions which have T (perpendicular)/T(parallel) much greater than 1. It can also be excited by gyrating proton beam distributions. These distributions generate whistler waves with frequencies ranging from 10 to 100 times the proton cyclotron frequency (in the solar wind reference frame) and provide another mechanism for generating the '1-Hz' waves often seen in the earth's foreshock.
Document ID
19880033132
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
November 1, 1987
Publication Information
Publication: Journal of Geophysical Research
Volume: 92
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
88A20359
Funding Number(s)
CONTRACT_GRANT: NSF ATM-84-05536
Distribution Limits
Public
Copyright
Other

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