Akebono (EXOS D) observations of small-scale electromagnetic signatures relating to polar cap precipitation

Details Akebono (EXOS D) observations of small-scale electromagnetic signatures relating to polar cap precipitation Akebono (EXOS D) observations of small-scale electromagnetic signatures relating to polar cap precipitation

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9811153o&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A7, p. 11,153-11,159.

Computer Science

Sound

19

Electric Fields, Electromagnetic Properties, Electron Precipitation, Exos-D Satellite, Polar Caps, Distribution Functions, Electromagnetic Measurement, Satellite Sounding

Scientific paper

We have analyzed small-scale electric and magnetic field variations and electron fluxes which were obtained by the Akebono (EXOS D) satellite in the polar cap region. An electron precipitation most often coincides with a large gradient of flow velocity in which div E is negative (type 1). However, sometimes a steep negative div E is seen only at the edge of a wider region of electron precipitation (type 2). We also observed cases where no particle precipitation occurred in the region of negative div E (type 3). For both type 1 and type 2 cases, a common signature is a spikelike enhancement in the electric field and associated plasma flow in which electron precipitation can be seen on a side where div E is negative. The direction of the spikelike flow is not unique; both sunward flow and antisunward flow are observed. Hence the location of the upward current and the downward current with respect to the noon-night direction depends on the flow direction in the spike.

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