On the possibility of auroral remote sensing with the Viking Ultraviolet Imager

Details On the possibility of auroral remote sensing with the Viking Ultraviolet Imager On the possibility of auroral remote sensing with the Viking Ultraviolet Imager

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.2845s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A3, March 1, 1992, p. 2845-2862.

Physics

6

Auroras, Electron Precipitation, Remote Sensing, Satellite Imagery, Ultraviolet Photography, Auroral Zones, Electron Energy, Pixels, Viking Spacecraft

Scientific paper

Results are presented of an investigation carried out to assess the value of UV auroral images for remote sensing of electron precipitation. Auroral images obtained by both cameras of the Viking Ultraviolet Imager during April and early May 1986 were compared with simultaneous measurements of electron precipitation from the DMSP F7 and HiLat satellites at low altitudes above the auroral zone. The electron data were averaged over the image pixels and were used to normalize the imager signals to unit electron energy flux. The resulting quantity, or 'effective sensitivity', showed large scatter about the mean values for both cameras that tended to mask any energy dependence except a decrease at electron energies above 6 keV. It is concluded that images from either Viking camera may be used to infer the instantaneous distribution of electron energy deposition, with roughly 50-percent accuracy.

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