Abstract
ECCENTRIC geomagnetic dipole1 time at an observatory (O) is defined for present purposes as the difference in eccentric dipole longitude (ɛ′) of the Sun (as distinct from the sub-polar point) and the observatory being measured eastwards from the Sun to the observatory, that is: Elsewhere2,3 it has been shown by different approaches that tecc. runs parallel to ordinary geomagnetic time (a centric system) differing by a constant C0, which is a characteristic of the observatory for the particular epoch of the Earth's magnetic field. Thus, also : where ɛ represents geomagnetic longitude. where3: X=−0.0577, Y=0.0320, Z=0.0184 for epoch 1955.0 and (θ0, ɛ0) are geographic co-ordinates of the observatory.
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COLE, K., SIMONOW, G. A Ready Method for finding Eccentric Dipole Time. Nature 199, 1279–1280 (1963). https://doi.org/10.1038/1991279a0
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DOI: https://doi.org/10.1038/1991279a0
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