Physics
Scientific paper
Sep 1963
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963saosr.134.....w&link_type=abstract
SAO Special Report #134 (1963)
Physics
Scientific paper
The simplest explanation of the second-order perturbations of the earth's gravitational field is the assumption that density anomalies of small magnitude exist in the interior of the earth. Here an explanation for such perturbations is sought based on the distribution of heat flows over the surface of the earth. A correlation is found to exist between high heat flow and low gravity, and their opposites. These sets of data are interpreted using the convection-current hypothesis, concluding that the material under the depressed geoid (gravitational equipotential surface) may be lighter and hotter, but motions are not necessarily indicated. The phenomena may be explained by thermal convections in the mantel with ascending currents in the mantle-carrying lighter material, bringing heat to the top of the mantle. This creates high surface heat flow over the ascending currents and lowers the surrounding gravity.
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