Abstract
IN the most recent analysis of the Earth's magnetic field (for the epoch 1942), Spencer Jones and Melotte1 evaluated forty-eight coefficients in the spherical harmonic expansion of the magnetic potential. Using their values for a spheroidal Earth, the X (northerly) and Y (easterly) components of the Earth's magnetic field were calculated at heights of 100 km. and 250 km. above the Earth's surface for θ = 5°, 10°, 15°, 20° and 25° and for ϕ = 240°, 250° and 260° E., where θ and ϕ are the co-latitude and longitude respectively. The heights 100 and 250 km. were chosen to correspond to the E- and F-layers of the ionosphere. For the purpose of comparison, X and Y were also evaluated at the Earth's surface and in every case the value of H = (X 2 + Y 2)1,2 was computed.
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References
Spencer Jones, H., and Melotte, P. J., Mon. Not. Roy. Astro. Soc., Geophys. Supp., 6, 409 (1953).
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JACOBS, J. Effect of Altitude on the Position of the Magnetic Pole. Nature 178, 35–36 (1956). https://doi.org/10.1038/178035b0
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DOI: https://doi.org/10.1038/178035b0
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