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The excess secular change in the obliquity of the ecliptic and its relation to the internal motion of the Earth

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Abstract

Criticisms of the senior author's paper (1967) are examined, and it is found that there still seems to be a possibility that the cause of the excess secular change is in the mantle-core coupling. Part II is devoted to an improvement of the previous result (Aoki, 1969) using a model of the elastic mantle and fluid core. In order to give the observed value of excess secular change of the obliquity, a value of the coupling coefficient of the Earth's rotation is 3.5 times larger than Rochester's (1968) value is required. This is not impossible from the geophysical view-point. In fact, if we take into account Hide's argument (1969), then the coupling coefficient will be much larger than the present geophysical value.

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Authors and Affiliations

  1. Tokyo Astronomical Observatory, Mitaka, Tokyo, Japan

    Shinko Aoki

  2. International Latitude Observatory, Mizusawa, Iwate, Japan

    Chuichi Kakuta

Authors
  1. Shinko Aoki
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  2. Chuichi Kakuta
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Aoki, S., Kakuta, C. The excess secular change in the obliquity of the ecliptic and its relation to the internal motion of the Earth. Celestial Mechanics 4, 171–181 (1971). https://doi.org/10.1007/BF01228820

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