Two encounters with the flank low-latitude boundary layer - Further evidence for closed field topology and investigation of the internal structure

Details Two encounters with the flank low-latitude boundary layer - Further evidence for closed field topology and investigation of the internal structure Two encounters with the flank low-latitude boundary layer - Further evidence for closed field topology and investigation of the internal structure

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9621025t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Dec. 1, 1991, p. 21,025-21,035. Research supported by NASA.

Physics

54

Boundary Layers, Energetic Particles, Magnetosheath, Space Plasmas, Tropical Regions, Angular Distribution, Electron Distribution, Energy Spectra, International Sun Earth Explorers, Ion Distribution

Scientific paper

The 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.

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