Abstract
A neutron monitor has been in operation aboard a magnetic survey aircraft. During a cruise in November, 1958, the latitude effect of the nucleonic component was measured over the same route between Tokyo and the Aleutian Islands as that covered by Sandstrom in February, 1957. Although the two sets of data normalized at Tokyo are in agreement up to approximately 43° N (modified geomagnetic latitude), a change in the shape of the curve had occurred at higher latitudes. The intensity at 55° N had decreased by 13%, and the « knee » had shifted from 47° N to 43° N. The latitude variation of the absorption mean free path was determined from intensityvs. altitude curves at geomagnetic latitudes 50° N, 37° N, 25° N, and 13° N. A change of roughly 10% over a range of primary cut-off rigidity from 2 GV to 15 GV was indicated. Comparison with earlier results of others revealed no appreciable variation of the mean free path during the solar cycle.
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