@article{oai:naragakuen.repo.nii.ac.jp:00000486,
 author = {藪下, 信 and Anthony J., Allen and Yabushita, Shin and Anthony J., Allen},
 journal = {情報学フォーラム, Information Science Forum},
 month = {},
 note = {A model is presented which relates the geological and paleonthological events of the past 300
million years to the sun's passage through the spiral arms of the Galaxy. It is an extension of
the ideas presented by McCrea, Clube & Napier and Begelma & Rees, and is based on a recent
work of Leitch & Vasishit which shows that the sun was most probably in the spiral arms at the
times of the well-known Cretaceous-Tertiary and Permian-Triassic boundaries. An argument is
presented which relates the accretion of the IS gas cloud onto the sun to the change in the solar
luminosity, which in turn brings about the changing rotational period of the earth, whereby the
boundary layer between the core and the mantle is disturbed to generate a superplume, which
leads to flood basalts at the surface; a superchron of the geomagnetic field is brought to a halt
by the greater temperature gradient in the layer. The encounter(s) with IS clouds disturbs the
Oort cloud of comets, injecting comets into the inner solar system, some of them becoming
earth impactors. It is shown that this model is consistent with geological and palaeonthological
data so far known.},
 pages = {1--10},
 title = {The Spiral Arms, Superplumes, Superchrons and Mass Extinctions},
 volume = {2},
 year = {2003},
 yomi = {ヤブシタ, シン}
}