Solar UV Radiation and the Origin of Life on Earth

Details Solar UV Radiation and the Origin of Life on Earth Solar UV Radiation and the Origin of Life on Earth

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.0314h&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #03.14; Bulletin of the American Astronomical Society, Vol. 33, p.1305

Astronomy and Astrophysics

Astronomy

Scientific paper

We have embarked on a program aimed at understanding the atmosphere of the early Earth, because of its importance as a greenhouse, radiation shield, and energy source for life. Here, we give a progress report on the first phase of this program: to establish the UV radiation from the early Sun. We are presently obtaining ultraviolet spectra (STIS, FUSE, EUVE) of carefully selected nearby, young solar-type stars, which act as surrogates for the early Sun. We are currently making detailed non-LTE analyses of the spectra and constructing models of their photospheres + chromospheres. Once validated, these models will allow us to extrapolate our theoretical spectra to unobserved spectral regions, and to proceed to the next step: to develop photochemical models of the pre-biotic and Archean atmosphere of the Earth.

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