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The objective of the Atmospheric Lyman-Alpha Emissions (ALAE)
experiment was to measure atomic hydrogen and deuterium in the
terrestrial atmosphere. The ALAE was flown on the Space Shuttle as
part of the Atmospheric Laboratory for Science and Applications (ATLAS
1). The instrument consists of a spectrophotometer with an atomic
hydrogen absorption cell and an atomic deuterium absorption
cell. Various combinations of switching the cells on and off allow
observations of the atmospheric deuterium layer, the atomic geocorona,
and the Lyman-alpha interplanetary medium.
Further information about the ATLAS-1 mission can be found at:
"http://wwwghcc.msfc.nasa.gov/atlas1.html"
IDN_Node: USA/NASA
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