Cosmic ray neutron intensity in solar cycles 19 and 20

Details Cosmic ray neutron intensity in solar cycles 19 and 20 Cosmic ray neutron intensity in solar cycles 19 and 20

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977sterj...1...84w&link_type=abstract

Solar Terrestrial Environmental Research in Japan, vol. 1, Dec. 1, 1977, p. 84-86.

Physics

Cosmic Rays, Neutron Flux Density, Solar Activity Effects, Solar Neutrons, Sunspots, Amplitude Distribution Analysis, Neutron Counters, Periodic Variations, Solar Cycles

Scientific paper

Cosmic ray intensity is correlated with sunspot number during solar cycles 19 and 20. Particular attention is given to problems of analyzing the long-term variation of cosmic ray intensity; for solar cycle 19 no more than six neutron monitors were available, while during solar cycle 20, 10 to 20 monitors were operating. The study shows a hysteresis loop in the cosmic ray intensity/sunspot number correlation in cycle 19, indicating a lag of cosmic ray modulation behind sunspot variation. The recovery of cosmic ray intensity at the sunspot minimum is also discussed.

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