Substorm-associated energetic ion (E of about 45 keV) flows at the plasma sheet boundary layer - A dawn-dusk flow reversal

Details Substorm-associated energetic ion (E of about 45 keV) flows at the plasma sheet boundary layer - A dawn-dusk flow reversal Substorm-associated energetic ion (E of about 45 keV) flows at the plasma sheet boundary layer - A dawn-dusk flow reversal

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990p%26ss...38.1251s&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 38, Oct. 1990, p. 1251-1266.

Physics

6

Energetic Particles, Geomagnetic Tail, Ion Injection, Magnetohydrodynamic Flow, Plasma Drift, Plasma Sheaths, Diurnal Variations, International Sun Earth Explorers, Ion Distribution, Statistical Analysis

Scientific paper

This work presents statistical results of ISEE-1 observations of energetic ions (E of about 45 keV) streaming at the plasma sheet boundary layer (PSBL), during thinnings and expansions of the tail plasma sheet associated with substorms. It is shown that the recovery PSBL events are more anisotropic, with higher peak intensities and shorter time durations than the thinning ones. Earthward streaming is found to be prevalent in the premidnight PSBL region, while tailward streaming is more frequent in the postmidnight flank. This flow reversal in the dominant streaming direction is more distinct for the entry events and is most probably the result of an underlying circulation pattern of energetic ions in the magnetotail. It is suggested that dawnward drifts of earthward-injected energetic ions, which take place in the presence of strong magnetic field gradients in the vicinity of the PSBL, play an important role in the generation of the circulation pattern and in particular the distinct tailward streaming at the dawn PSBL.

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