Approximate corrections to the vertical threshold rigidities for cosmic rays in the earth's magnetic field are given, which take into account both the effects of the non-dipole part of the internal field and the penumbra. The thresholds obtained are tabulated every 2½° geographic latitude and every 5° geographic longitude. The accuracy of these thresholds is discussed and it is shown that they fit experimental data better than do previous approximations.
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Quenby et al. (1962) studied this question.
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