Dissipation of the Primordial Terrestrial Atmosphere Due to irradiation of the Solar EUV

SEKIYA Minoru, NAKAZAWA Kiyoshi, HAYASHI Chushiro, of Physics Kyoto University Department, of Physics Kyoto University Department, of Physics Kyoto University Department

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Abstract

The escape of a primordial Earth's atmosphere due to heating by solar radiation is studied by integrating numerically hydrodynamic equations for steady and spherically-symmetric outflow of hydrogen molecules and helium atoms. As heating sources, we take account of (1) the solar EUV radiation which is expected to be very strong during the T Tauri stage, (2) the solar visible light and (3) the release of gravitational energy of accreting planetesimals. The effect of solar wind is neglected but the condition of this neglect is estimated. The results show that the pimordial atmosphere, having existed in the early stage of the Earth's history, is dissipated within a period of 5×10^8 y, which is the upper limit imposed from the origin of the present terrestrial atmosphere, as far as the solar EUV flucx is more than 2×10^2 times as large as the present one.
Original languageEnglish
Pages (from-to)1968-1985
Number of pages18
JournalProgress of Theoretical Physics
Volume64
Issue number6
DOIs
Publication statusPublished - Dec 25 1980
Externally publishedYes

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