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On the origin of the fluctuations in the length of day and in the geomagnetic field on a decadal time scale
Author(s) -
Duhau Silvia,
Martínez Ernesto A.
Publication year - 1995
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/95gl03285
Subject(s) - earth's magnetic field , geophysics , momentum (technical analysis) , angular momentum , mantle (geology) , scale (ratio) , geology , physics , ring current , mechanism (biology) , statistical physics , magnetic field , atmospheric sciences , classical mechanics , finance , quantum mechanics , economics
There is, at present, strong evidence that on a decadal time scale the excess length of day variations are caused by the exchange of angular momentum between the liquid core and the solid mantle. Nevertheless the mechanism which facilitates the momentum exchange is still not understood. In the present work a mechanism by which the magnetospheric equatorial ring current system controls the momentum exchange is introduced, some empirical insights about that mechanism are obtained from relevant data and the magnitudes of the involved magnetic fields are evaluated from these data.