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 400km/sec. We show that the horseshoe type distribution is unstable to predominantly perpendicular ion waves with frequencies in the lower-hybrid range.
CITATION STYLE
Bingham, R., Kellett, B. J., Cairns, R. A., Dendy, R. O., & Shukla, P. K. (1999). Wave generation by ion horseshoe distributions on auroral field lines. Geophysical Research Letters, 26(17), 2713–2716. https://doi.org/10.1029/1999GL900582
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