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Pioneer 10 and 11 observations of waves upstream of interplanetary corotating shocksAn extended region of enhanced magnetic field fluctuations is found upstream of some of the corotating shocks observed by Pioneer 10 and Pioneer 11 between 1 and 5 AU. This perturbed region is present when the corotating shock, generally quasi-perpendicular, becomes oblique or quasi-parallel due to a temporary out-of-spiral direction of the upstream magnetic field. The observed waves are almost not compressional. Their amplitude is a large fraction of the ambient field, and their frequency is around 1 mHz in the spacecraft frame. A brief discussion of the possible mechanisms of generation is given.
Document ID
19870041556
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bavassano, Bruno
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Smith, Edward J.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Tsurutani, Bruce T.
(California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Publication Information
Publication: Journal of Geophysical Research
Volume: 92
ISSN: 0148-0227
Subject Category
Astrophysics
Accession Number
87A28830
Distribution Limits
Public
Copyright
Other

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