On the origin of the fluctuations in the length of day and in the geomagnetic field on a decadal time scale
Abstract
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.
- Publication:
-
Geophysical Research Letters
- Pub Date:
- December 1995
- DOI:
- 10.1029/95GL03285
- Bibcode:
- 1995GeoRL..22.3283D
- Keywords:
-
- Tectonophysics: Core processes (1507);
- Planetology: Solid Surface Planets: Magnetic fields and magnetism;
- Geomagnetism and Paleomagnetism: Time variations-secular and long term;
- Geodesy and Gravity: General or miscellaneous