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Generation of low-frequency waves at Comet HalleyThe extent to which the properties of the waves observed at comet Halley during the Giotto encounter can be understood within the context of linearized Vlasov theory is investigated. In the region that is magnetically connected to the comet, fluctuations in the plasma frame of reference are detected near 4 and 10 mHz, close to the water cyclotron frequency, as well as at 20-60 mHz, which is well above the water cyclotron frequency. Using a variety of approximations for the ion distribution function, it is shown that waves having properties similar to those observed can then be generated with appropriate choices of plasma parameters. In the region that is magnetically disconnected from the comet, distinct peaks are observed in the magnetic power spectrum at 7, 21, 29, and 35 mHz, with a hint of a peak at 14 mHz.
Document ID
19900035873
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Goldstein, M. L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wong, H. K.
(Southwest Research Institute San Antonio, TX, United States)
Glassmeier, K. H.
(Koeln, Universitaet Cologne, Federal Republic of Germany, United States)
Date Acquired
August 14, 2013
Publication Date
February 1, 1990
Publication Information
Publication: Journal of Geophysical Research
Volume: 95
ISSN: 0148-0227
Subject Category
Astrophysics
Accession Number
90A22928
Funding Number(s)
CONTRACT_GRANT: NSF ATM-87-13225
Distribution Limits
Public
Copyright
Other

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