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Some low-altitude cusp dependencies on the interplanetary magnetic fieldThe low-altitude cusp dependencies on the interplanetary magnetic field (IMF) were investigated using the algorithm of Newell and Meng (1988) to identify the cusp proper. The algorithm was applied to 12,569 high-latitude dayside passes of the DMSP F7 spacecraft, and the resulting cusp positioning data were correlated with the IMF. It was found that the cusp latitudinal position correlated reasonably well (0.70) with the Bz component when the IMF had a southward component. The correlation for the northward Bz component was only 0.18, suggestive of a half-wave rectifier effect. The ratio of cusp ion number flux precipitation for Bz southward to that for Bz northward was 1.75 + or - 0.12. The statistical local time widths of the cusp proper for the northward and the southward Bz components were found to be 2.1 h and 2.8 h, respectively.
Document ID
19890058251
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Newell, Patrick T.
(Johns Hopkins Univ. Laurel, MD, United States)
Meng, CHING-I.
(Johns Hopkins Univ. Laurel, MD, United States)
Sibeck, David G.
(Johns Hopkins University Laurel, MD, United States)
Lepping, Ronald
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 14, 2013
Publication Date
July 1, 1989
Publication Information
Publication: Journal of Geophysical Research
Volume: 94
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
89A45622
Funding Number(s)
CONTRACT_GRANT: AF-AFOSR-88-0101
CONTRACT_GRANT: NSF ATM-87-13212
Distribution Limits
Public
Copyright
Other

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