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Abstract

abstract

The latitude distribution of cosmic rays at sea level, in the region of the Cape Town Magnetic Anomaly, compares well with the distribution in the North American region when vertical cutoff rigidities computed from particle trajectories in a simulated geomagnetic field are used. From the North American latitude distribution during minimum modulation of cosmic rays .in May 1965, the distributions in January of each year from 1963 through to 1970 were calculated. They were found to compare well with the survey data if uncertainties in air pressure and changes in the rigidity dependence of the modulation of cosmic rays in 1969 and 1970 were taken into consideration.