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Science 11 May 1973:
Vol. 180. no. 4086, pp. 638 - 640
DOI: 10.1126/science.180.4086.638
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Articles

Periodic Insolation Variations on Mars

Bruce C. Murray 1, William R. Ward 1, and Sze C. Yeung 1

1 Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena 91109

Previously unrecognized insolation variations on Mars are a consequence of periodic variations in eccentricity, first established by the theory of Brouwer and Van Woerkom (1950). Such annual insolation variations, characterized by both 95,000-year and 2,000,000-year periodicities, may actually be recorded in newly discovered layered deposits in the polar regions of Mars. An additional north-south variation in seasonal insolation, but not average annual insolation, exists with 51,000-year and 2,000,000-year periodicities.


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