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Fluorescence of molecular hydrogen excited by solar extreme-ultraviolet radiation (1973)

Feldman, P. D. ; Fastie, W. G.

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Publication Date: 2019-06-27

Description: During trans-earth coast, the Apollo 17 ultraviolet spectrometer was scheduled to make observations of the far ultraviolet background in selected regions of the sky. In the course of one of these observations, the spacecraft fuel cells were routinely purged of excess hydrogen and water vapor. The ultraviolet fluorescence spectrum of the purged molecular hydrogen excited by solar extreme ultraviolet radiation is interpreted by absorption of solar L-beta and L-gamma radiation in the nearly resonant (6, 0) and (11, 0) Lyman bands. The results are deemed significant for ultraviolet spectroscopic investigations of the atmospheres of the moon and planets since Lyman-band fluorescence provides an unambiguous means of identification of molecular hydrogen in upper atmospheres.

Keywords: SPACE RADIATION

Type: Astrophysical Journal; 185; Oct. 15

Format: text

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