Correlation between Cosmic Ray Neutron Intensities in Morioka and Tokyo during a Solar Rotation

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Continuous observations of cosmic ray neutron intensity using the IGY-typeneutron monitor are being carried out since August 1970 in Morioka. In this paper,correlation coefficients between the neutron intensities in Morioka and Tokyo-Itabashiduring a solar rotation interval are calculated using the neutron data obtained duringthe period 1971-1974 in Morioka and Tokyo-Itabashi. Dependences of the coefficientson geomagnetic activity and solar activity are studied and discussed in comparisonwith results from the cosmic ray data observed at the other cosmic ray stations. Itis concluded that such correlations are closely related to the associated geomagneticactivity and solar activity.The time lag of cosmic ray modulation due to solar activity which amounts toapproximately one year is suggested for the period 1972-1974. and it may besignificantly changeable from year to year.
岩手大学教育学部の論文