On the low energy electrons in the magnetotail

Details On the low energy electrons in the magnetotail On the low energy electrons in the magnetotail

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13...53p&link_type=abstract

Advances in Space Research, Volume 13, Issue 4, p. 53-58.

Computer Science

2

Scientific paper

Prognoz-8 was in the geotail (R <= 30 RE) during summer 1981. In several cases the satellite encountered a dense (0.5-5 cm-3) plasma with low-energy electrons (kT0=50-100 eV) in the tail regions far away from the magnetopause boundary layers. During quiet conditions with northward interplanetary magnetic field this low-energy plasma forms a thick layer which may extend up to 12 RE over the hotter plasma sheet core in the midnight sector. During strongly disturbed conditions the low-energy plasma was observed in the pre-dawn sector of the tail close to the neutral sheet at geocentric distances as low as ~8 RE. In such situations this soft plasma population was very ``active'' with strong ion flows or a ring-like ion distribution function, intense low-frequency electric field fluctuations and presence of O+ field aligned beams. Our data suggest that the low-latitude magnetopause boundary layer (LLBL) is the source of low-energy plasma in regions adjacent to the plasma sheet boundary layer/central plasma sheet during substorms. Phase space densities and the form of the distribution function of low energy electrons in the tail as measured by Prognoz-8 make them similar to the low temperature component of auroral electrons.

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