Low energy upflowing ion events observed by Exos-D - Initial results

Details Low energy upflowing ion events observed by Exos-D - Initial results Low energy upflowing ion events observed by Exos-D - Initial results

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..337s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Feb. 1991, p. 337-340.

Physics

3

Exos Satellites, Exos-D Satellite, Geomagnetism, Ionospheric Ion Density, Magnetic Measurement, Satellite Observation, Energy Transfer, Ion Distribution, Ionospheric Currents, Japanese Space Program

Scientific paper

Initial observations of low-energy upflowing ion events from the Suprathermal Ion Mass Spectrometer (SMS) on Exos-D are presented. The SMS instrument measures the mass composition, energy, and angular distributions of thermal and suprathermal ions in the 0.1-4000 eV/q energy-per-charge and 0.8-70 amu/q mass-per-charge ranges. Two events are examined. The first features predominantly conical ion pitch-angle distributions, and the second has mainly field-aligned distributions. Both events displayed small-scale variations in upward flux, composition, and angular characteristics, and coincided with small-scale magnetic field fluctuations. In both events, the peak He(+) and H(+) fluxes were comparable; the O(+) flux was a factor of 5-10 larger. The pitch-angle distribution often switched rapidly between field-aligned and conical.

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