Martin 2009 伽玛暴对地球大气的影响

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Title:		Short-term Effects of Gamma Ray Bursts on Earth
Authors:		Martín, Osmel; Galante, Douglas; Cárdenas, Rolando; Horvath, J. E.
Publication:		eprint arXiv:0904.1755
Publication Date:		04/2009
Origin:		ARXIV
Keywords:		Astrophysics - Earth and Planetary Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Comment:		13 pp., to appear in Astrophysics and Space Science
Bibliographic Code:		2009arXiv0904.1755M

Abstract

The aim of the present work is to study the potential short-term atmospheric and biospheric influence of Gamma Ray Bursts on the Earth. We focus in the ultraviolet flash at the planet's surface, which occurs as a result of the retransmission of the $\gamma$ radiation through the atmosphere. This would be the only important short-term effect on life. We mostly consider Archean and Proterozoic eons, and for completeness we also comment on the Phanerozoic. Therefore, in our study we consider atmospheres with oxygen levels ranging from $10^{-5}$ to 1% of the present atmospheric level, representing different moments in the oxygen rise history. Ecological consequences and some strategies to estimate their importance are outlined.

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