Secular changes of LOD associated with a growth of the inner core

Details Secular changes of LOD associated with a growth of the inner core Secular changes of LOD associated with a growth of the inner core

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006an....327..309d&link_type=abstract

Astronomische Nachrichten, Vol.327, Issue 4, p.309

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Earth Rotation, Secular Variation Of The Length Of Day, Differential Rotation

Scientific paper

From recent estimates of the age of the inner core based on the theory of thermal evolution of the core, we estimate that nowadays the growth of the inner core may perhaps contribute to the observed overall secular increase of LOD caused mainly by tidal friction (i.e., 1.72 ms per century) by a relative decrease of 2 to 7 μs per century. Another, albeit much less plausible, hypothesis is that crystallization of the inner core does not produce any change of LOD, but makes the inner core rotate differentially with respect to the outer core and mantle.

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