Abstract
A uniform set of geomagnetic data from observatories has been analysed to determine secular variation of the geomagnetic field for the interval 1942.5 to 1962.5 and to reveal any changes in secular variation during this time. The epoch to epoch changes are much smoother than have been previously found, and permit an examination of the movements of the centred and eccentric dipoles and changes in westward drift. The secular variation has also been used to determine surface motions of the Earth's core. Changes in secular variation are presented in the form of charts of secular acceleration.
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