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Published March 3, 1969 | Published
Journal Article Open

Cosmic-Ray Negatron and Positron Spectra Between 12 and 220 MeV


The interplanetary negatron and positron spectra from 12 to 220 MeV have been determined with a balloon-borne magnetic spectrometer. The observed charge ratio e^+(e^+ + e^−)≈0.3 indicates that the flux most likely consists of a mixture of "primary" negatrons and interstellar "secondary" negatrons and positrons. We deduce an absolute solar modulation of the interstellar positron flux which decreases with decreasing magnetic rigidity below about 80 MV.

Additional Information

© 1969 American Physical Society. Received 23 December 1968. Work supported by the National Aeronautics and Space Administration under Grant No. NGL-05-002-007. Space Radiation Laboratory. SRL ID #: 1969-04.

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