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

研究成果: Contribution to journalArticle査読

抄録

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.
本文言語英語
ページ(範囲)1968-1985
ページ数18
ジャーナルProgress of Theoretical Physics
64
6
DOI
出版ステータス出版済み - 12 25 1980
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