More evidence for an exospheric hydrogen sub-solar bulge

Details More evidence for an exospheric hydrogen sub-solar bulge More evidence for an exospheric hydrogen sub-solar bulge

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976georl...3..715e&link_type=abstract

Geophysical Research Letters, vol. 3, Dec. 1976, p. 715-717.

Physics

Exosphere, Gas Density, Hydrogen Clouds, Interplanetary Gas, Atmospheric Attenuation, Hydrogen Atoms, Lyman Alpha Radiation, Oso-5

Scientific paper

Measurements of the geocoronal absorption at the center of the solar Lyman-alpha line, performed by the University of Paris instrument on board OSO-5 are compared to aspherical models. The deduced values of the minimum hydrogen density were analyzed over periods of one year, between 1969 and 1972. They indicate a systematic departure up to 40 per cent from exospheric models. This feature corresponds to a dayside sub-solar hydrogen bulge characterized by a 25 per cent decrease of the hydrogen density at 50 deg away (northward or southward) from the solar direction. This bulge could be due to solar direction related anisotropies of the hydrogen production, diffusion, transport and loss mechanisms which are neglected in the exospheric theories.

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