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The Lyman alpha photometer (LAP) on board the SS-520-1 rocket,
which was launched at sunset at 0830 UT on February 5, 1998,
observed geocoronal H and D Lyman alpha emissions. The LAP has H
and D abserption cells to measure H and D Lyman alpha emission
separately. The width of Lyman alpha emission can be estimated
by changing the optical depth of the cell by switching the
filament current of each cell.
Additional information available at
"http://www-jm.eps.s.u-tokyo.ac.jp/1999cd-rom/pdf/ed/ed-p016_e.pdf"
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