Letter | Published:

A Ready Method for finding Eccentric Dipole Time

Nature volume 199, pages 12791280 (28 September 1963) | Download Citation

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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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References

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    , and , Geophys. J., Roy. Astro. Soc., 1, 346 (1958).

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    , Austral. J. Phys., 16 (in the press).

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    , and , Nature, 198, 874 (1963).

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    , and , Austral. J. Phys., 15, 261 (1962).

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    , J. Atmos. Terr. Phys., 24, 17 (1961).

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Author information

Affiliations

  1. Antarctic Division, Department of External Affairs, Melbourne.

    • K. D. COLE
    •  & G. V. SIMONOW

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DOI

https://doi.org/10.1038/1991279a0

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