"Knee" of the cosmic-ray latitude curve

Abstract

A phenomenon of considerable interest in the study of the distribution of cosmic-ray intensity over the earth has been the apparent absence of low-energy particles in the primary radiation. At sea level the "knee" is probably due to atmospheric absorption and has been placed at 40° to 45° geomagnetic north. At high altitudes a number of divergent results have been obtained by various observers.(1) We wish to point out that some of this seemingly contradictory evidence may be due to the fact that the data were taken at different times.

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