Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84..120l&link_type=abstract
Journal of Geophysical Research, vol. 84, Jan. 1, 1979, p. 120-124. NSF-supported research.
Astronomy and Astrophysics
Astronomy
11
Neutron Counters, Primary Cosmic Rays, Solar Activity Effects, Solar Cycles, Spaceborne Astronomy, Intermodulation, Particle Diffusion, Particle Telescopes, Pioneer 8 Space Probe, Plasma-Particle Interactions
Scientific paper
Ground-based neutron monitor data and primary cosmic ray observations made on spacecraft were used to investigate the cosmic ray modulation in the rigidity range P = 0.34-50 GV for the period 1965-1976. The variation of the energy loss parameter during this period was determined from the integral cosmic ray intensity (at energies exceeding 60 MeV) measured by satellite cosmic ray telescopes with the rigidity dependence of the diffusion coefficient K2(P) proportional to P for P not greater than 10 GV. It was found that the hysteresis effect between the integral cosmic ray intensity (at energies exceeding 60 MeV) and the neutron monitor rates at Mount Washington could be explained by assuming that for P not less than PT, K2(P) changed from K2 alpha P to K2 alpha P-squared, following the theoretical arguments of Jokipii (1971).
Lockwood John A.
Webber William R.
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