Physics
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90..477s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Jan. 1, 1985, p. 477-490.
Physics
23
Balmer Series, Geocoronal Emissions, H Alpha Line, Atmospheric Temperature, Emission Spectra, Exosphere, Fabry-Perot Spectrometers, Hydrogen, Night Sky, Radiant Flux Density, Solar Activity Effects
Scientific paper
Geocoronal L-beta emission was observed from the lunar surface during the Apollo 16 mission. The present investigation is concerned with new observations of geocoronal H-alpha emission. The observations were conducted between October, 1981, and January, 1983, using a Fabry-Perot spectrometer with high sensitivity, high spectral resolution, and high photometric accuracy. The observations provide an accurate data base which makes it possible to study some of the remaining questions about the hydrogen geocorona. The morning H-alpha intensity enhancement relative to the evening value is found to be only approximately 10 percent, which is appreciably less than that expected by the current diurnal variation theory of the hydrogen density.
Roesler Fred L.
Scherb Frank
Shih P.
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