Cosmic Radiation Intensity-Time Variations and Their Origin. V. The Daily Variation of Intensity

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Abstract
Properties of the 24-hour intensity variations which were established by ion chamber and counter telescope measurements at high primary-particle energies have now been extended to the low-energy portion of the primary spectrum by measurements with high-altitude neutron piles at geomagnetic latitudes 0° and 48°. The observations demonstrate that the peak-to-peak amplitude of the 24-hour variation increases with latitude and, hence, is dependent on primary-particle rigidity. The latitude ratio for the peak-to-peak variation is ∼1.4±0.2 and the amplitude at 48° is of the order 1 percent. These facts preclude primary neutrons or a general solar dipole field as the origin of this intensity variation.