A Caltech Library Service

Cosmic-Ray Experiments at High Altitudes over a Wide Range of Latitudes

Biehl, A. T. and Neher, H. V. and Roesch, W. C. (1949) Cosmic-Ray Experiments at High Altitudes over a Wide Range of Latitudes. Physical Review, 76 (7). pp. 914-932. ISSN 0031-899X. doi:10.1103/PhysRev.76.914.

See Usage Policy.


Use this Persistent URL to link to this item:


A number of experiments made in a B-29 on the properties of cosmic rays are herein reported. These include the latitude effect of the following, performed along the 80th geographic west longitude from 64° geomagnetic north to the geomagnetic equator, all at a constant pressure altitude of 30,000 ft. (3.10 m of water equivalent): (1) Intensity at the vertical without and with lead absorber; (2) intensity at 45° West and 45° East both without and with lead absorber; (3) total ionization intensity; (4) extensive showers. Also measured at 48° North and at the geomagnetic equator were the following: (1) Zenith angle effect both without and with lead absorber; (2) intensity vs. air pressure without and with lead; (3) extensive showers vs. air pressure; (4) local showers. In addition to the above the variation in azimuth of the cosmicray intensity was measured with the various telescopes tipped at 22½°, 45°, and 67½° to the vertical at an elevation corresponding to 2.35 m of water equivalent at the geomagnetic equator. Two lead thicknesses were used, 10 and 20 cm, inserted between the counter trays. These experiments throw new light on the nature of the primary radiation and on the interaction of the primary particles with the matter through which they pass.

Item Type:Article
Related URLs:
URLURL TypeDescription
Additional Information:©1949 The American Physical Society Received 20 June 1949 In conclusion the authors wish to thank the Office of Naval Research and the United States Air Forces for making these flights possible. Above all we wish to express our appreciation to Major W.A. Gustafson, Captain Freyer, Lt. Brandon and the other members of the crew of the B-29 for their cooperation and efforts spent in making these flights successful.
Issue or Number:7
Record Number:CaltechAUTHORS:BIEpr49b
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8698
Deposited By: Archive Administrator
Deposited On:06 Sep 2007
Last Modified:08 Nov 2021 20:52

Repository Staff Only: item control page