Physics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984angeo...2...37g&link_type=abstract
Annales Geophysical (ISSN 0755-0685), vol. 2, Jan.-Feb. 1984, p. 37-45.
Physics
7
Earth Core, Geomagnetism, Magnetic Variations, Drift Rate, Earth Surface, Secular Variations, Spherical Harmonics
Scientific paper
The westward drift rate of the geomagnetic field as observed at the earth's surface is evaluated using different techniques and sets of data. The most striking feature of the recent period is the rapid increase of the drift rate after 1970. This change is particularly sharp when considering estimates based on Y (East) component and raw observatory data. The question of the westward drift of the external layers of the core is then addressed. The inversion of secular variation data - in the frozen-flux approximation - does evidence, despite the poor resolution of the inversion process, a westward drift of the upper core which also seems to be faster in 1980 than in 1970.
Gire C.
Le Mouël Jean Louis
Madden Thomas
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