Long-term variations of the Primary Cosmic-Ray Electron Component

• Published in: Canadian Journal of Physics
• Main Authors: L'Heureux, Jacques, Meyer, Peter, Verma, Satya Dev, Vogt, Rochus
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: NRC Research Press 1968
• Subjects: Churchill
• Online Access: https://authors.library.caltech.edu/44631/; https://resolver.caltech.edu/CaltechAUTHORS:20140403-100701561

The intensity of primary cosmic-ray electrons has been measured from 1960 through 1966 at balloon altitude over Ft. Churchill, Manitoba. Initial measurements were made with an energy-loss vs. range counter telescope from 1960 through 1964. From 1964 through 1966 an energy-loss vs. total energy counter telescope was used. Overlapping data exist for both instruments in 1964. Our results are consistent with the absence of a solar modulation effect for electrons in the 0.25 to 1.05 BV rigidity range. The experimental errors lead to an upper limit of 60% for the possible fractional change of the electron intensity over this period.