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observations of the magnetic fluctuation enhancement in the earth's foreshock regionUpstream waves have been postulated to be a major source of energy for the dayside magnetic pulsations within the magnetosphere. Thus, it is of interest to determine over what frequency range in the ion foreshock the power of fluctuations in the solar wind is enhanced. The magnetic field data from pairs of spacecraft, when they stay on either side of the ion foreshock boundary, were examined. It was found that the power of magnetic fluctuations is enhanced only at periods less than about two minutes, not at longer periods. Thus the upstream waves may contribute to Pc 3 and Pc 4 pulsations in the dayside magnetosphere, but they cannot be directly responsible for the longer-period waves.
Document ID
19900051275
Document Type
Reprint (Version printed in journal)
Authors
Le, G.
(California Univ. Los Angeles, CA, United States)
Russell, C. T.
(California, University Los Angeles, United States)
Date Acquired
August 14, 2013
Publication Date
June 1, 1990
Publication Information
Publication: Geophysical Research Letters
Volume: 17
ISSN: 0094-8276
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAG5-1163
CONTRACT_GRANT: NAG5-1067
Distribution Limits
Public
Copyright
Other