Physics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.2647e&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, May 1, 1984, p. 2647-2654.
Physics
24
Cosmic Rays, High Energy Electrons, Solar Activity Effects, Cerenkov Counters, Electron Counters, International Sun Earth Explorer 3, Modulation, Spectrum Analysis
Scientific paper
The ISEE 3 spacecraft has provided over 4 years of continuous data from nearby interplanetary space. By using these data together with prelaunch calibration data and precise electron spectra from balloon flights in 1979 and 1982 at Thompson, Manitoba, Canada, the flux level of approximately 1 GeV cosmic ray electrons with 1 month time resolution is monitored. The step-like onset of modulation observed for positive particles in 1979 is also seen in electrons, confirming that the dominant modulation mechanism is not sensitive to the charge of the particle. Hysteresis effects observed in the previous solar maximum by Burger and Swanenburg (1973) are not reproduced at the present solar maximum. A return to the relatively higher electron/proton ratios of the 1960s is a strong possibility. Conclusions must be drawn with caution, however, since the overall time structure of the present solar maximum is significantly different from that of the previous one.
Evenson Paul
Meyer Pascal
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