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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.

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