A Possible Expansion of the Newell-Meng Criteria to Distinguish Between Open and Closed LLBL

Details A Possible Expansion of the Newell-Meng Criteria to Distinguish Between Open and Closed LLBL A Possible Expansion of the Newell-Meng Criteria to Distinguish Between Open and Closed LLBL

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm32a04b&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM32A-04

Mathematics

Logic

2716 Energetic Particles, Precipitating, 2724 Magnetopause, Cusp, And Boundary Layers, 2776 Polar Cap Phenomena

Scientific paper

Electron precipitation data from two co-orbiting Defense Meteorological Satellite Program spacecraft (F6 and F8), exhibit characteristic low-energy (magnetosheath) and high-energy (plasma sheet) populations over the same latitudinal range, during a southern hemisphere pass on January 10, 1990. The latitudinal extent of the overlapping electron features is 0.7 degrees in the F6 data, but is increased to 1.5 degrees in the F8 data, one minute later, in both the poleward and equatorward directions. The region can be identified as either Plasma Sheet or Low-Latitude Boundary Layer (LLBL) using the Newell-Meng Criteria for region identification, depending on which identification is given priority. We argue that it constitutes the low-altitude signature of a "closed" LLBL. We suggest a qualitative expansion of the criteria to include an open versus closed topology for the LLBL. The combined F6/F8 identifications for the entire data set (77 double passes) based on the expanded criteria, are then used for a statistical investigation of the suggested open/closed LLBL geometries. We conclude that the open and closed LLBL have almost equal probability of occurrence, and the expected latitudinal distribution. A previously proposed unifying model of magnetopause reconnection can account for the production of LLBL on both topologies during southward IMF conditions.

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