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Seasonal cosmic-ray effects at sea level

Millikan, R. A. and Neher, H. V. and Smith, D. O. (1939) Seasonal cosmic-ray effects at sea level. Reviews of Modern Physics, 11 (3-4). p. 166. ISSN 0034-6861.

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By sending a Neher self-recording electroscope in a 10-cm lead shield repeatedly on a slow Norwegian steamer over the route Vancouver-Los Angeles, around South America and return to Los Angeles and Vancouver we find: (1) As heretofore, an equatorial dip, measured from Los Angeles, of 7 percent on the western side of South America, 8 percent on the eastern side; (2) no seasonal sea-level effect at Los Angeles or at any point south of there down to the Straits of Magellan that is of sufficient magnitude to stand out above the fluctuations -- as much as 0.6 percent-observable at the different localities traversed in these voyages; (3) as heretofore on the voyage between Los Angeles and Vancouver, constancy in cosmic-ray intensity in summer and fall, within the limits of uncertainty imposed by the fluctuations, estimated here as certainly not over 1 percent; (4) in winter and spring, however, a definite increase in different voyages of 2 percent or 3 percent in going from Los Angeles to Vancouver.

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Additional Information:© 1939 by The American Physical Society.
Issue or Number:3-4
Record Number:CaltechAUTHORS:MILrmp39
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11133
Deposited By: Tony Diaz
Deposited On:17 Jul 2008 18:08
Last Modified:03 Oct 2019 00:16

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