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

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概要

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• 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.

• 理論物理学刊行会の論文
• 1980-12-25

著者

• Nakazawa Kiyoshi

  Department of Cardiology, St. Marianna University School of Medicine

• SEKIYA Minoru

  Department of Applied Physics, Tokyo Institute of Technology

• HAYASHI Chushiro

  Department of Physics, Kyoto University

• Nakazawa Kiyoshi

  Department Of Physics Kyoto University

• Hayashi Chushiro

  Department Of Nuclear Science Kyoto University

• Sekiya Minoru

  Department Of Physics Kyoto University

• Sekiya Minoru

  Department Of Earth And Planetary Sciences Faculty Of Sciences 33 Kyushu University

• Sekiya Minoru

  Department Of Applied Physics Tokyo Institute Of Technology

• Nakazawa Kiyoshi

  Department Of Applied Physics Tokyo Institute Of Technology

• NAKAZAWA Kiyoshi

  Department of Applied Physics, Tokyo Institute of Technology

• SEKIYA Makoto

  Department of Physics, Kyoto University

• SEKIYA Minoru

  Department of Physics, Kyoto University

• SEKIYA Minoru

  Department of Earth and Planetary Sciences, Faculty of Sciences 33, Kyushu University

• HAYASHI Chushiro

  Department of Nuclear Science : Research Institute for Fundamental Physics Kyoto University : National Aeronautics and Space Administration

• Nakazawa Kiyoshi

  Gifu University

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