Observations of atomic deuterium in the mesosphere from ATLAS 1 with ALAE instrument

Details Observations of atomic deuterium in the mesosphere from ATLAS 1 with ALAE instrument Observations of atomic deuterium in the mesosphere from ATLAS 1 with ALAE instrument

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..507b&link_type=abstract

Geophysical Research Letters, Volume 20, Issue 6, p. 507-510

Computer Science

Sound

4

Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry, Atmospheric Composition And Structure: Instruments And Techniques

Scientific paper

During the first ATLAS mission, the ALAE Lyman α spectrophotometer collected various measurements of hydrogen and deuterium atoms, from the mesosphere, the thermosphere, the exosphere and the interplanetary medium. In this paper is presented a preliminary analysis of some observations of atomic deuterium, which Lyman α emission is excited by resonance scattering of solar photons. Nadir measurements along the sunlit Earth part of the orbit show that the emission changes as a function of solar zenith angle. Comparison with a simple model shows that, from the shuttle altitude of 300 km and at low solar zenith angles, the line-of-sight probes atomic deuterium down to 80 km of altitude (where O2 absorption is complete), whereas at angles from 60° to 90°, the mesospheric part of the emission progressively vanishes. Then, the remaining emission mainly consist of the thermospheric part (z>=100 km). This type of observations provides a sounding of atomic deuterium at its peak production and concentration, and D atoms can be used as a proxy to H atoms (which cannot be observed from a satellite) in this particularly active region of the mesosphere.

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