Publication Date:
2019-07-18
Description:
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 have obtained ultraviolet spectra (STIS, FUSE, EUVE) of carefully selected nearby, young solar-type stars, which act as surrogates for the early Sun We are 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 other metallicities and to unobserved spectral regions.
Keywords:
Solar Physics
Type:
Origins 2002: The Heavy Element Trail from Galaxies to Habitable Worlds; May 26, 2002 - May 29, 2002; Jackson Hole, WY; United States
Format:
text
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