Cosmic-Ray Intensity above the Atmosphere at High Latitudes
Abstract
The total charged particle cosmic-ray intensity above the atmosphere has been measured with thin-walled Geiger counters (total effective stopping power of apparatus and residual atmosphere 0.5 g/cm2 of aluminum) carried in balloon-launched rockets at geomagnetic latitudes 54.3° N, 62.1° N, 71.9° N, and 86.7° N. The respective values of unidirectional particle intensity averaged over the upper hemisphere are: J¯=0.44+/-0.01, <=0.50+/-0.05, <=0.50+/-0.05, and =0.48+/-0.01 (cm2 sec sterad)-1. These results are consistent with the complete or nearly complete absence of primary cosmic rays having a magnetic rigidity less than 1.7×109 volts.
- Publication:
-
Physical Review
- Pub Date:
- July 1955
- DOI:
- 10.1103/PhysRev.99.198
- Bibcode:
- 1955PhRv...99..198M