The low-latitude boundary layer and the boundary plasma sheet at low altitude - Prenoon precipitation regions and convection reversal boundaries

Details The low-latitude boundary layer and the boundary plasma sheet at low altitude - Prenoon precipitation regions and convection reversal boundaries The low-latitude boundary layer and the boundary plasma sheet at low altitude - Prenoon precipitation regions and convection reversal boundaries

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9621013n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Dec. 1, 1991, p. 21,013-21,023.

Physics

130

Boundary Layers, Convection, Current Sheets, Particle Precipitation, Plasma Layers, Tropical Regions, Earth Magnetosphere, Electron Density (Concentration), Low Altitude, Radar Tracking, Spectrograms

Scientific paper

A detailed spectra study, including comparisons with nonsimultaneous ISEE 1 satellite low-latitude-boundary-layer (LLBL) data, is used to identify regions of LLBL-type plasma in the DMSP data set and compare them with convection reversal boundaries (CRBs). Nine cases are considered, all in the prenoon local time sector. In eight of the nine cases, the CRB is found to occur within the LLBL as expected, generally near, but not coincident with, the equatorward edge of the LLBL-type plasma. The average latitudinal width was 1.85 arcsec magnetic latitude. The CRB, defined as the onset of steady antisunward convection, occurred about 30 percent of this width beyond the equatorward onset of LLBL-type particles. The most equatorward portion of the region with LLBL-type plasma usually had near-zero or erratic convection and may correspond to the 'stagnation region' reported from ISEE observations. A summary is given on how the various high-altitude sources can be identified when plasma regions are observed at low altitude in the dayside auroral oval.

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