Abstract
view Abstract Citations (1) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Direct Determination of Neutral Hydrogen between the Earth and the Sun. Mange, P. ; Purcell, J. D. ; Tousey, R. Abstract Profiles of the Solar Lyman-alpha line obtained by means of a rocket-borne spectrograph exhibit a deep narrow absorption line superimposed on a broad shallow central reversal. The observed width of the core at half-maximum, 0.05A, even without correction for instrumental broadening, indicates absorption by hydrogen at a temperature of no more than 3300~K. The absorption core is therefore attributed to hydrogen outside the solar atmosphere. From the observed depth and breadth of the absorption, the total hydrogen between the sun and the H-region of the earth's atmosphere is calculated to be 3 X 1011 atoms/cm2 column, with an estimated accuracy factor of 2. The absorption curves are examined for compatability with suggested distributions of hydrogen in the terrestrial atmosphere, taking into account molecular diffusion and the variation of temperature with altitude. Publication: The Astronomical Journal Pub Date: 1960 DOI: 10.1086/108103 Bibcode: 1960AJ.....65R..54M full text sources ADS |
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