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Title:
Periodic mass extinctions and the sun's oscillation about the galactic plane
Authors:
Schwartz, R. D.; James, P. B.
Affiliation:
AA(Missouri, University, St. Louis, MO), AB(Missouri, University, St. Louis, MO)
Publication:
Nature (ISSN 0028-0836), vol. 308, April 19, 1984, p. 712, 713. (Nature Homepage)
Publication Date:
04/1984
Category:
Astronomy; Miscellaneous
Origin:
STI; LPI [AN-840692%J]
NASA/STI Keywords:
BIOLOGICAL EVOLUTION, EXTINCTION, SOLAR POSITION, SOLAR SYSTEM, HARMONIC OSCILLATION, PALEONTOLOGY
LPI Keywords:
EARTH, EXTINCTION, SUN, OSCILLATIONS, PERIODICITY, HYPOTHESES, MOTION, TIME SCALE, CALCULATIONS, COSMIC RAYS, RADIATION, ELECTROMAGNETIC EFFECTS
DOI:
10.1038/308712a0
Bibliographic Code:
1984Natur.308..712S

Abstract

A possible correlation between the 26-Myr extinction period reported by Raup and Sepkoski (1984) and the sun's oscillation about the galactic plane is pointed out. The extinction level for electromagnetic radiation in the 2 keV-01 eV range and the galactic cosmic ray distribution both change with distance from the galactic plane, and their possible role as agents of mass extinctions is briefly examined.
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