Physics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pthph..66.1301s&link_type=abstract
Progress of Theoretical Physics, Vol. 66, No. 4, pp. 1301-1316
Physics
27
Scientific paper
If the Earth was formed in a stage before the gas of a solar nebula was dissipated, it was surrounded by a dense primitive atmosphere with the solar chemical composition. The atmosphere was gravitationally bound to the Earth after the solar nebula was dissipated by strong solar wind in a T Tauri stage. We calculate numerically the escape of this atmosphere due to heating by strong solar radiation, especially by far-UV radiation absorbed through photodissociation of water molecules.
We assume that the flow of the atmospheric gas is spherically-symmetric and steady. The results show that the efficiency of mass loss by the far-UV radiation is very large compared with the case of EUV radiation, which was studied previously, and that the atmosphere was wholly dissipated within 2 × 107y, i.e., a typical period of the T Tauri stage, if the far-UV flux was more than 1 × 102 times as large as the present value. This flux is well expected from observations of T Tauri stars. The effect of solar wind is found to be unimportant.
Hayashi Chuichiro
Kanazawa Kiyoshi
Sekiya Minoru
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