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A statistical study of magnetic field magnitude changes during substorms in the near earth tailUsing AMPTE/CCE data taken in 1985 and 1986 when the CCE apogee (8.8 earth radii) was within 4.5 hours of midnight, 167 injection events in the near-earth magnetotail have been cataloged. These events are exactly or nearly dispersionless on a 72-sec time scale from 25 keV to 285 keV. The changes in the field magnitude are found to be consistent with the expected effects of the diversion/disruption of the cross-tail current during a substorm, and the latitudinal position of the current sheet is highly variable within the orbit of CCE. The local time variation of the magnetic-field changes implies that the substorm current wedge is composed of longitudinally broad Birkeland currents.
Document ID
19900054858
Document Type
Reprint (Version printed in journal)
Authors
Lopez, R. E. (Applied Research Corp. Landover, MD, United States)
Lui, A. T. Y. (Applied Research Corp. Landover, MD, United States)
Mcentire, R. W. (Applied Research Corp. Landover, MD, United States)
Potemra, T. A. (Applied Research Corp. Landover, MD, United States)
Krimigis, S. M. (Johns Hopkins University Laurel, MD, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Publication Information
Volume: 10
ISSN: 0273-1177
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: N00039-87-C-5301
Distribution Limits
Public
Copyright
Other