Spatial distribution of cosmic ray intensity and geomagnetic theory

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Abstract
Data recorded in a world-wide investigation of relationships between the spatial distribution of cosmic ray intensity and the magnetic field of the earth have been compared with the predictions of geomagnetic theory. Measurements obtained with a neutron monitor in the U.S. Navy Hydrographic Office Airborne Geomagnetic Survey-Project MAGNET are well organized in terms of new calculations of vertical threshold magnetic rigidities by Quenby and Wenk, who have taken into account the effects of the dipole and non-dipole parts of the field as well as the penumbral correction. Except for the observations over one region in the North Atlantic, a plot of nucleonic intensity versus threshold rigidity reveals that all the points fall within a narrow band.