Extreme ultraviolet dayglow observations with a helium gas absorption cell

Details Extreme ultraviolet dayglow observations with a helium gas absorption cell Extreme ultraviolet dayglow observations with a helium gas absorption cell

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..787f&link_type=abstract

Geophysical Research Letters, vol. 5, Sept. 1978, p. 787-790.

Other

4

Dayglow, Far Ultraviolet Radiation, Helium, Ultraviolet Absorption, Ultraviolet Photometry, Apollo Soyuz Test Project, Data Reduction, Ultraviolet Spectrophotometers

Scientific paper

During the Apollo-Soyuz Test Project, an extreme-ultraviolet photometer with a cyclically operated helium gas-absorption cell observed the daytime sky from an orbital altitude of 225 km. When the line of sight pointed more than 60 deg from the sun, the instrument detected 2 to 70 rayleighs of flux scattered from neutral geocoronal helium at wavelengths from 504 to 584 A. The instrument also detected other radiation in the band 500-700 A of similar spatial distribution to the helium flux, which was definitely not due to the He I 584-A spectral line and which has not been detected by previous experimenters in data from 400 km altitude. Possible sources of this radiation are discussed.

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