Physics
Scientific paper
Apr 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976p%26ss...24..303t&link_type=abstract
Planetary and Space Science, vol. 24, Apr. 1976, p. 303-312.
Physics
16
Airglow, Gas Density, Hydrogen Atoms, Lyman Alpha Radiation, Solar Activity Effects, Atom Concentration, Least Squares Method, Ogo-6, Solar Position, Sunspots, Ultraviolet Photometry
Scientific paper
The paper analyzes a one-year set of Lyman-alpha airglow data measured in the local zenith at altitudes from 400 to 1100 km by a UV photometer aboard OGO-6. The zenith-intensity data are fitted to theoretical airglow calculations in four spherically symmetric models of the hydrogen geocorona to determine both the Ly-alpha solar flux at line center and the average atomic hydrogen column density. After correcting for a loss of instrument sensitivity, the Ly-alpha flux is found to be linearly correlated with daily Zurich sunspot number. It is also found that the hydrogen density is inversely correlated with Jacchia exospheric temperature, but the dependence is not that predicted by steady-state models with Jeans evaporative escape as the only loss mechanism. It is suggested that charge-exchange production of fast hydrogen atoms from 'hot' ionospheric protons might provide the additional loss this result requires.
Anderson Donald E. Jr.
Thomas Gareth E.
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