Solar wind induced atmospheric erosion from a EUV heated and expanded early Earth atmosphere

Details Solar wind induced atmospheric erosion from a EUV heated and expanded early Earth atmosphere Solar wind induced atmospheric erosion from a EUV heated and expanded early Earth atmosphere

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..807l&link_type=abstract

European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a

Computer Science

Scientific paper

Abstract Higher EUV fluxes of the young Sun led to a warmer and expanded thermosphere at early Earth than today. Under conditions, depending on the thermospheric composition and the amount of IR-coolers, hydrostatic equilibrium was not always maintained and hydrodynamic flow and expansion of the upper atmosphere resulting in adiabatic cooling of the exobase temperature could develop. Depending on the atmospheric protection by the Earth's magnetosphere, the current atmospheric composition was determined by atmospheric escape processes, volcanic outgassing and the appearance of life. Recent model results indicate that depending on the higher solar EUV flux of the young Sun, the exosphere could expand beyond the magnetopause. The constituents above the magnetopause could be ionized and picked up by the solar wind plasma flow. By applying a numerical test particle model and expected magnetosphere configurations, we study the non-thermal loss rates of nitrogen, oxygen and hydrogen ions which are eroded from extended exospheres by the solar wind of the young Sun during the period where life appeared on Earth. Thermal and non-thermal loss rates are compared and the relevance of the results related to early Earth atmosphere studies will be discussed. [1] Lammer, H., Kasting, J. F., Chassefíere, E., Johnson, R. E., Kulikov, Yu. N., Tian, F., (2008) Space Sci. Rev., submitted.

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