Mathematics – Logic
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.261..298b&link_type=abstract
Nature, vol. 261, May 27, 1976, p. 298, 299.
Mathematics
Logic
29
Climatology, Interstellar Matter, Meteorological Parameters, Solar Wind, Climate Change, Gas Density, Interplanetary Medium, Long Term Effects, Solar Activity Effects
Scientific paper
The question is investigated of whether past immersion of the solar system in dense interstellar matter (ISM) might have left observable imprints on the earth. It is demonstrated analytically that an ISM density of only 0.01 to 0.001 per cu cm would prevent the solar wind from reaching earth, and it is proposed that such a change in the earth's space environment may trigger drastic climatic changes. The analytical results are taken as possible evidence in favor of a previous suggestion that there may be a causal connection between spiral-arm traversals by the solar system and the quasi-periodic epochs of glaciation inferred from the geological record. Some effects of excluding the earth from the 'heliosphere' are discussed. It is concluded that if terrestrial temperature is correlated with energetic-particle flux, then shutting off the solar wind may be the mechanism for triggering an ice age.
Begelman Mitchell C.
Rees Martin J.
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