Wave generation by ion horseshoe distributions on auroral field lines

Details Wave generation by ion horseshoe distributions on auroral field lines Wave generation by ion horseshoe distributions on auroral field lines

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2713b&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 17, p. 2713-2716

Physics

5

Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Energetic Particles, Precipitating, Magnetospheric Physics: Plasma Waves And Instabilities

Scientific paper

Recent observation by Freja satellite of ions in the auroral zone at the boundary of the plasma sheet and tail lobe reveal the presence of a ring or horseshoe type distribution function. The horseshoe type distribution function measured by the satellites has a field aligned component which is moving in the case of the Freja data in the down-going direction with a peak velocity of about 400 km/sec. We show that the horseshoe type distribution is unstable to predominantly perpendicular ion waves with frequencies in the lower-hybrid range.

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