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AGU: Geophysical Research Letters

 

Index Terms

  • Magnetospheric Physics: Auroral phenomena
  • Magnetospheric Physics: Plasma waves and instabilities
  • Space Plasma Physics: Wave-particle interactions
  • Space Plasma Physics: Waves and instabilities

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 14, NO. 4, PP. 463-466, 1987
doi:10.1029/GL014i004p00463

Ion waves and upgoing ion beams observed by the Viking satellite

Mats André

Kiruna Geophysical Institute, University of Umeå, S‐901 87 Umeå, Sweden

Hannu Koskinen

Uppsala Ionospheric Observatory, S‐755 90 Uppsala, Sweden

Georg Gustafsson

Uppsala Ionospheric Observatory, S‐755 90 Uppsala, Sweden

Rickard Lundin

Kiruna Geophysical Institute, P.O. Box 812, S‐981 28 Kiruna, Sweden

Simultaneous observations of waves and ion beams by the Viking satellite can be used to study wave‐particle interaction on auroral field lines. The characteristics of the observed beams may be rather stable during long periods, at least up to 20 minutes. However, the wave charateristics during such events may vary within seconds. Sometimes the wave experiment detects narrowband EHC waves, sometimes broadband emissions up to several times the proton gyro frequency, and sometimes just an increased level of turbulence. The variations of the wave characteristics may at least partly be due to variations in a cool, low density electron population.

Received 1 December 1986; accepted 14 January 1987; .

Citation: André, M., H. Koskinen, G. Gustafsson, and R. Lundin (1987), Ion waves and upgoing ion beams observed by the Viking satellite, Geophys. Res. Lett., 14(4), 463–466, doi:10.1029/GL014i004p00463.

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