Mathematics – Probability
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.6001m&link_type=abstract
American Astronomical Society Meeting 210, #60.01; Bulletin of the American Astronomical Society, Vol. 39, p.169
Mathematics
Probability
Scientific paper
Atmospheric oxygen generates stratospheric ozone, which strongly absorbs solar UV in the range 280-320 nm, which is damaging to many organic molecules, particularly DNA.
A variety of astrophysical sources of ionizing radiation, including nearby supernovae, large solar flares, and galactic gamma-ray bursts have high probability of impact upon the Earth’s atmosphere over the past 0.5 Gy. Such events dissociate molecular nitrogen, making possible the formation of oxides of nitrogen which catalyze the destruction of ozone, with potentially disastrous effects for life. Other effects related to nitrate deposition and climate change are possible. I describe the results of simulating such events, and present simplifying approximations that enable estimation of the likely atmospheric effect of a given event.
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