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Observations of a transverse magnetic field perturbation at two altitudes on the equatorward edge of the magnetospheric cuspOn January 28, 1990, the Dynamic Explorer 1 (DE-1) and Akebono satellites crossed a magnetic field structure at the equatorward edge of the polar cusp at altitudes od 22,000 and 5000 km, respectively, within 6 min of each other. Locally measured plasma particles and fields and magnetometer data from a ground station near the foot of the magnetic field line are more consistent with an interpretation of the structure as that of a standing Alfven wave than that of a quasi-steady field-aligned current sheet. We discuss the observations supporting this conclusion and other related observations of field-aligned currents, Alfven waves, and ion energization near the equatorward edge of the cusp. These observations suggest that Alfven waves are commonly present near the equatorward edge of the cusp.
Document ID
19950046669
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Peterson, W. K.
(Lockheed Space Sciences Lab. Palo Alto, CA, United States)
Abe, T.
(National Research Council of Canada Ottawa, Canada)
Andre, M.
(Umea Univ. Umea, Sweden)
Engebretson, M. J.
(Augsburg Coll., Minneapolis, MN United States)
Fukunishi, H.
(Tohoku Univ. Miyagi, Japan)
Hayakawa, H.
(Inst. of Space and Astronomical Science Sagamihara, Japan)
Matsuoka, A.
(Inst. of Space and Astronomical Science Sagamihara, Japan)
Mukai, T.
(Inst. of Space and Astronomical Science Sagamihara, Japan)
Persoon, A. M.
(Iowa Univ. Iowa City, IA, United States)
Retterer, J. M.
(Phillips Lab. Hanscom AF Base, MA, United States)
Date Acquired
August 16, 2013
Publication Date
December 1, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: A12
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
95A78268
Funding Number(s)
CONTRACT_GRANT: NAS5-33032
CONTRACT_GRANT: NAS5-529
CONTRACT_GRANT: NAG5-1325
Distribution Limits
Public
Copyright
Other

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