Equatorial longitude effects on cosmic rays

Abstract

At the meeting of the National Academy just a year ago Dr. Neher and I presented our evidence for a previously unsuspected effect in cosmic rays which we termed the "longitude effect." This effect had been brought to light by the sending of vibration-free self-recording electroscopes on a number of voyages from Los Angeles to Mollendo, Peru, and back, and at the same time on a Dollar Line trip around the world. The very accurate records obtained on these voyages, when studied carefully in the laboratory in January 1934, brought to light the fact that in going from the north temperate zone into the equatorial belt the decrease in the sea level cosmic ray intensity is only 8 per cent between San Francisco and Mollendo while it is 12 per cent when the passage from the temperate zone into the equatorial belt takes place on the other side of the world, that is, in the region of Singapore and Batavia.

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