Mathematics – Logic
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988em%26p...41..173t&link_type=abstract
Earth, Moon, and Planets (ISSN 0167-9295), vol. 41, May 1988, p. 173-190.
Mathematics
Logic
Earth Surface, Glaciology, Ice Formation, Interstellar Matter, Paleoclimatology, Solar System, Cloud Glaciation, Earth Albedo, Gravitational Collapse, Mars Atmosphere, Titan, Venus Atmosphere
Scientific paper
The hypothetical conditions for interstellar clouds dense enough to produce glaciations on the earth are examined. A simple differential formula is used to relate mean temperatures and visual albedos now and during the glacial eras, using the geological and oceanographical records of the Pleistocene. It is found that mean interstellar clouds able to produce glaciations would have dust densities of 4100 mag/pc and sizes of 0.3 pc or more, taking into account the time span of the glacial eras, the mean velocity of the sun with respect to LSR, and the minimum dust absorption necessary to start a glacial era. Such clouds are shown to be incompatible with what is known from the interstellar medium. The necessary number of clouds per cubic parsec would produce the collapse of the galactic disk as a whole. It is suggested that the cause of the ice ages was the sun itself.
Pellegatti Franco G. A.
Quiroga Ramon Julian
Tarsia R. D.
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