Other
Scientific paper
Sep 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973natur.245...25m&link_type=abstract
Nature, Volume 245, Issue 5419, pp. 25-26 (1973).
Other
7
Scientific paper
HALLEY1 first noticed that the magnetic declination at a number of sites changed with time in a manner that was consistent with a steady westward drift of the magnetic field relative to the surface of the Earth. After long neglect, interest in westward drift was revived by the work of Bullard et al.2, who examined the westward drift of the non-dipole part of the field, which they considered to originate less deep within the core than the slower moving dipole field. Since then, there have been numerous other studies (for example refs 3-5) introducing various refinements, such as separation of the field into drifting and standing parts, variation of drift rate with latitude and separate rates of drift for each harmonic component. A common feature of all such studies is that they consider the drift of the field to be a rotation about the geographical axis. Here we remove this constraint and examine the possibility that the secular changes in the magnetic field might be more closely represented by rotation about an axis other than the geographical axis. This should not be confused with the ``northward drift''6,7 which is merely the change in the latitude coordinate of the eccentric dipole position.
Malin R. C. S.
Saunders Ian
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