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: English
• Published: Canadian Science Publishing 1968
• Subjects: General Physics and Astronomy; Churchill
• Online Access: http://dx.doi.org/10.1139/p68-377; http://www.nrcresearchpress.com/doi/pdf/10.1139/p68-377

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.