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Two encounters with the flank low-latitude boundary layer - Further evidence for closed field topology and investigation of the internal structureThe structure of the flank low-latitude boundary layer (LLBL) is examined through differential energy spectra and particle angular anisotropies for traversals of the dawn flank (December 19, 1977) and dusk flank (July 7, 1978) during periods of predominantly northward magnetosheath field orientation. Spectra are presented that were obtained from combined ISEE 1 low-energy-proton and electron-differential-energy-analyzer and medium-energy-particle-instrument data extending over the 200-eV/q to 2-MeV energy range for the plasma sheet, stagnation region, outer LLBL, and magnetosheath regions. The stagnation region and the outer LLBL are each a mixture of plasma-sheet and magnetosheath populations, but the stagnation region contains a relatively higher fraction of plasma sheet particles, consistent with its placement earthward of the outer LLBL. Evidence for energization of thermal electrons appears during the dusk flank crossing. Bidirectional field-aligned ion distributions are observed with typically 5-to-1 enhancement of the flux along the magnetic field during certain portions of the dusk flank crossing.
Document ID
19920034380
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Traver, D. P.
(Johns Hopkins Univ. Laurel, MD, United States)
Mitchell, D. G.
(Johns Hopkins Univ. Laurel, MD, United States)
Williams, D. J.
(Johns Hopkins University Laurel, MD, United States)
Frank, L. A.
(Johns Hopkins Univ. Laurel, MD, United States)
Huang, C. Y.
(Iowa, University Iowa City, United States)
Date Acquired
August 15, 2013
Publication Date
December 1, 1991
Publication Information
Publication: Journal of Geophysical Research
Volume: 96
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
92A17004
Funding Number(s)
CONTRACT_GRANT: NSF ATM-89-18858
CONTRACT_GRANT: N00039-89-C-5301
Distribution Limits
Public
Copyright
Other

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