Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1971
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971cemec...4..171a&link_type=abstract
IAU System of Astronomical Constants, Proceedings of IAU Colloq. 9, held in Heidelberg, August, 1970. Edited by T. Lederle and B
Astronomy and Astrophysics
Astronomy
12
Scientific paper
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.
Aoki Shinko
Kakuta Chuichi
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