Physics
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984sci...225..174b&link_type=abstract
Science (ISSN 0036-8075), vol. 225, July 13, 1984, p. 174-176. Research supported by the Centre National d'Etudes Spatiales and
Physics
10
Lyman Alpha Radiation, Spacecraft Instruments, Spacelab, Upper Atmosphere, Deuterium, Doppler Effect, Hydrogen, Real Time Operation, Spectrophotometers
Scientific paper
A spectrophotometer was flown on Spacelab 1 to study various mechanisms of Lyman-alpha emission in the upper atmosphere. The use of absorption cells filled with H2 and D2 gases made it possible to discriminate a number of weak Lyman-alpha emissions heretofore masked by the strong H geocoronal emission due to resonance scattering of solar photons. Preliminary results are presented on three topics: the first optical detection of the deuterium Lyman-alpha emission at 110 kilometers, with an intensity of 330 rayleighs indicating an eddy diffusion coefficient of 1.3 x 10 to the 6th square centimeters per second; auroral proton precipitations seen on both the night and the day side; and an emission located above 250 kilometers of altitude, interpreted as the result of charge exchange of magnetospheric protons with geocoronal atoms.
Bertaux Jean Loup
Goutail Florence
Kockarts Gaston
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