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The latitude effect in cosmic rays at altitudes up to 29,000 feet

Bowen, I. S. and Millikan, R. A. and Korff, S. A. and Neher, H. V. (1936) The latitude effect in cosmic rays at altitudes up to 29,000 feet. Physical Review, 50 (7). pp. 579-581. ISSN 0031-899X. doi:10.1103/PhysRev.50.579.

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Accurate measurements with Neher recording electroscopes have been made both in Peru and in the Philippines on the cosmic-ray ionization of the atmosphere up to altitudes of 29,000 feet, with the following results: (1) In both localities the ionization rises essentially exponentially following a coefficient μ=0.50 per meter of water. This means that in the equatorial belt the ionization at 29,000 feet (two-thirds of the way to the top of the atmosphere) is about 50 ions per cc per sec., or half its value at the same altitude in the temperate zone. (2) If any longitude effect such as that which we have proved to exist at sea level exists at altitudes of 26,000 feet, it is inside the limits of our observational uncertainty, about 5 percent.

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Additional Information:©1936 The American Physical Society. Received 20 July 1936. We wish to express our appreciation to the Carnegie Corporation of New York and the Carnegie Institution of Washington as well as to the above-mentioned air services through whose aid the foregoing results have been made possible.
Issue or Number:7
Record Number:CaltechAUTHORS:BOWpr36
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5469
Deposited By: Tony Diaz
Deposited On:19 Oct 2006
Last Modified:08 Nov 2021 20:25

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