Ultraviolet stellar occultation measurement of the H2 and O2 densities near 100 km in the earth's atmosphere

Details Ultraviolet stellar occultation measurement of the H2 and O2 densities near 100 km in the earth's atmosphere Ultraviolet stellar occultation measurement of the H2 and O2 densities near 100 km in the earth's atmosphere

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976georl...3..607a&link_type=abstract

Geophysical Research Letters, vol. 3, Oct. 1976, p. 607-610. Research supported by the Lockheed Independent Research Program

Astronomy and Astrophysics

Astronomy

Gas Density, Hydrogen, Ionospheric Composition, Oxygen, Stellar Occultation, Atmospheric Models, Density Distribution, Earth Atmosphere, Oao 3, Satellite-Borne Instruments, Time Response, Ultraviolet Spectrometers

Scientific paper

Results are presented for an experimental study designed to measure the density of H2 near 100 km in the earth's atmosphere from occultation of a star, Gamma Vel, by the earth's atmosphere at several wavelengths near the H2 absorption line at 1108.128 A by a spectrometer on an orbiting astronomical observatory. Measurement of the O2 density between 95 and 123 km is also reported. Attention is focused on testing the predictions of a model of the distribution of hydrogen constituents, H, H2, H2O, CH4, OH, and H2O in the upper atmosphere related to a theory of hydrogen escape developed by Hunten and Strobel (1974) and by Liu and Donahue (1974). The measured H2 densities are found to be in good agreement with recent theoretical predictions, whereas the measured O2 density profile generally agrees with the models except for a wavelike structure in the range 104-114 km.

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