Physics – Geophysics
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ang....33..255l&link_type=abstract
(International Union of Geodesy and Geophysics, General Assembly, 16th, Grenoble, France, Aug. 25-Sept. 6, 1975.) Annales de Geo
Physics
Geophysics
Background Radiation, D-2 Satellites, Extraterrestrial Radiation, Geocoronal Emissions, Lyman Alpha Radiation, Night Sky, Calibrating, Data Reduction, Hydrogen Atoms, Satellite Observation, Satellite-Borne Instruments, Solar Flux Density
Scientific paper
The anti-solar experiment aboard the D2-A satellite involved measurements using a hydrogen absorption cell of geocoronal and interplanetary Lyman alpha emission. The analysis of data obtained on April 27, 1971 has shown that antisolar interplanetary emission is 200 Rayleigh, that the atomic hydrogen density at 500 km around midnight is of the order of 1.6 x 10 to the 5th atoms/cu cm, and that the local H atom density seems to vary with latitude. A uniform density layer was found at heights between 3000 and 6500 km, and the average global exobase density seems to be between 7 x 10 to the 4th and 10 to the 5th atoms/cu cm.
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