Physics
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.2395l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, April 1, 1984, p. 2395-2400.
Physics
60
Auroral Ionization, Auroras, Electron Precipitation, Energetic Particles, Proton Density (Concentration), Satellite Observation, Electric Current, Field Aligned Currents, Geomagnetic Tail, Plasmas (Physics)
Scientific paper
Low-altitude observations of the energy flux carried by precipitating auroral electrons are compared with simultaneous measurements of the more energetic particle population to determine the spatial relationships between discrete auroras and those regions where the ion population exhibits a full loss cone. Discrete auroras are identified as instances where large, spatially structured energy fluxes (in excess of 10 erg per sq cm s) are carried almost exclusively by precipitating electrons. This comparison makes it possible to infer a relation between discrete auroras and earthward streaming ions observed in the tail. Since discrete auroras occur in association with field-aligned currents, an evaluation is made of the suggestion that auroral field-aligned currents map to the outer boundary of the plasma sheet.
Evans Silvan D.
Lyons Larry R.
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