Effects of intense stratospheric ionisation events

Details Effects of intense stratospheric ionisation events Effects of intense stratospheric ionisation events

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.275..489r&link_type=abstract

Nature, vol. 275, Oct. 12, 1978, p. 489-492.

Mathematics

Logic

16

Atmospheric Chemistry, Atmospheric Ionization, Biosphere, Photochemical Reactions, Solar Flares, Solar Terrestrial Interactions, Stratosphere, Supernovae, Biological Effects, Nitrogen Oxides, Ozone, Ozone Depletion, Solar Cosmic Rays, Supernova Remnants, Ultraviolet Radiation

Scientific paper

The question is considered of whether the solar-flare mechanism proposed to account for the minor extinctions of terrestrial species that are associated with geomagnetic polarity reversals could also account for the much more catastrophic and massive extinctions that have tended to mark many of the major boundaries of the geological record. Depletion of stratospheric ozone due to hypothetical intense solar flares is examined, the possibility that nearby supernova explosions might be a cause of intense stratospheric ionization is discussed, and a one-dimensional time-dependent model of stratospheric photochemistry is used to study the effect of enhanced supernova-related cosmic-ray fluxes on the total solar radiation penetrating the stratosphere. It is concluded that the passage of earth through a supernova remnant would be likely to cause a prolonged period of harsh environmental conditions for the biosphere and that such conditions might or might not lead to major extinctions of animal populations.

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