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The experimental values of the geomagnetic cosmic‐ray effects have been used in calculating the change of cosmic‐ray intensity during a magnetic storm on the assumption that the magnetic disturbance can be regarded as a variation of the Earth's magnetic moment. The change in moment found necessary to produce the observed variations of cosmic‐ray intensity during the storm of April 1937 is of the order 150 times greater than any value simply reconcilable with the magnetic disturbances recorded.
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Thomas H. Johnson (1938) studied this question.
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