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- W2139798506 abstract "Summary—The rate of change of the vertical component of the earth-air electric current-density i is expressed in terms of the surface-gradients of the rates of change of the horizontal magnetic elements X and Y or D and H: the formulas enable (di/dt) to be calculated from the distribution of the isomagnetic and isoporic lines for these elements. It is shown that if the directions and spacing of the isoporic lines are seriously uncertain, (di/dt) should be found, from the magnetic charts, to have a value of order five milliamperes per km2 per year; this is confirmed by calculations based on the Admiralty charts for 1922, the Fisk isoporic charts for the same epoch, and the Swedish magnetic surveys of epochs 1929.5 and 1936.5. The actual value of (di/dt) is inferred, from atmospheric-electric observations, to be at most 10−4, so that these much larger calculated values of (di/dt) indicate errors in the isoporic charts." @default.
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- W2139798506 date "1942-01-01" @default.
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- W2139798506 title "Notes on Isomagnetic Charts: VIII—The Mutual Consistency of the Declination and Horizontal-Intensity Isoporic Charts" @default.
- W2139798506 doi "https://doi.org/10.1029/te047i002p00139" @default.
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