Counterstreaming electron beams at altitudes of about 1 R/E/ over the auroral zone

Details Counterstreaming electron beams at altitudes of about 1 R/E/ over the auroral zone Counterstreaming electron beams at altitudes of about 1 R/E/ over the auroral zone

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85...92s&link_type=abstract

Journal of Geophysical Research, vol. 85, Jan. 1, 1980, p. 92-100. Research supported by the U.S. Navy, Swiss National Science

Computer Science

Sound

22

Auroral Zones, Counterflow, Electron Beams, Magnetohydrodynamic Flow, Electron Energy, Explorer 12 Satellite, Mass Spectroscopy, Northern Hemisphere, Satellite Sounding

Scientific paper

Intense beams of electrons with energies in the keV range have been observed streaming simultaneously both parallel and antiparallel to the magnetic field direction at altitudes between 4000 and 8000 km at auroral latitudes. The peak flux observed was 3 x 10 to the 11th per sq m s sr keV at an energy of 160 eV. The beams are often tightly collimated with widths in pitch angle as narrow as about 1 deg. Analysis of the energy spectrums of the beams and the simultaneously observed loss cones in the trapped electron population shows that the energization of the beams cannot be understood as acceleration by a simple quasi-static parallel electric field. Alternative models include acceleration by wave-particle interactions or by fluctuating electric fields. One candidate model consistent with the observations is outlined in which the energetic electrons in the counterstreaming electron beams are accelerated from the ambient cold plasma by multiple flickering double layers located in the 1-earth-radius altitude range.

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