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Results of a High Altitude Cosmic-Ray Survey Near the Magnetic Equator

Neher, H. V. and Pickering, W. H. (1942) Results of a High Altitude Cosmic-Ray Survey Near the Magnetic Equator. Physical Review, 61 (7-8). pp. 407-413. ISSN 0031-899X. doi:10.1103/PhysRev.61.407.

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Electroscope and Geiger counter observations have been taken with free balloons at geomagnetic latitudes of 3°, 17°, and 25°N. The most important results are as follows: (1) The Geiger counter technique with a single counter will give results very close to those obtained with the electroscope and of comparable accuracy. (2) Vertical coincidence measurements give rise to markedly different values for the relative amounts of incident energy at various latitudes, as compared with the electroscope or single counter data. (3) Within the experimental error, no difference was obtained between the vertical coincidence curves at 3° and 17°, and thus no new energy lies in the primary energy spectrum between the limits of 17 and 15 Bev. (4) This is direct evidence for a banded structure in the primary cosmic-ray spectrum. (5) Flights made with triple and quadruple coincidences, and also with counters arranged to record showers, showed that showers do not significantly affect the vertical coincidence measurements.

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Additional Information:©1942 The American Physical Society Received 9 February 1942 In conclusion the authors wish to express their appreciation for the invaluable aid rendered by R.A. Millikan in the planning of these experiments, the observations in the field, and the discussion of the results. They sincerely thank the Carnegie Corporation of New York for the financial assistance which made this expedition possible, and they remember with great pleasure their many friends in the Indian Meteorological Service without whose help it would have been impossible to have made so many successful flights.
Issue or Number:7-8
Record Number:CaltechAUTHORS:NEHpr42
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6355
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Deposited On:04 Dec 2006
Last Modified:08 Nov 2021 20:33

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