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Field and thermal plasma observations of ULF pulsations during a magnetically disturbed intervalA ULF pulsation event is discussed on the basis of experimental observations of electric and magnetic field measurements as well as particle measurements from the DE 1 spacecraft. The observations were made near the magnetic equator in a space covering a large range of L shells and magnetic latitudes, and comparisons are made to ground observations. Azimuthal oscillations are observed following gradually decaying long-period compressional waves. Weak interaction between magnetic shells indicates that the source is probably weak, and ground data on magnetic pulsations showed strong signals that did not necessarily correspond to the quasisinusoidal pulsations observed in space. Azimuthal pulsations observed by the spacecraft indicate that there was a plasma density gradient beyond the plasmapause. The ULF pulsations were probably affected by changes in the magnetic field and solar-wind dynamic pressure, and their periods are found to be linked to geomagnetic latitude.
Document ID
19930026310
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lin, N.
(Minnesota Univ. Minneapolis, United States)
Engebretson, M. J.
(Augsburg College Minneapolis, MN, United States)
Reinleitner, L. A.
(Northwest Research Associates, Inc. Bellevue, WA, United States)
Olson, J. V.
(Alaska Univ. Fairbanks, United States)
Gallagher, D. L.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Cahill, L. J., Jr.
(Minnesota Univ. Minneapolis, United States)
Slavin, J. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Persoon, A. M.
(Iowa Univ. Iowa City, United States)
Date Acquired
August 15, 2013
Publication Date
October 1, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: A10
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
93A10307
Funding Number(s)
CONTRACT_GRANT: NSF ATM-89-12155
CONTRACT_GRANT: NAS5-529
CONTRACT_GRANT: NAG5-1325
CONTRACT_GRANT: NAG5-310
Distribution Limits
Public
Copyright
Other

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