Time Variations of the Barometric Coefficient of Cosmic Ray Neutron Component at Morioka, Tokyo and Mt. Norikura during the Period 1970-1973

In this paper, trial calculations of the barometric coefficient by various methods are given using the neutron component observed at Morioka, Tokyo, Mt. Norikura. And Deep River during the period, January 1970 - December 1973. The results of the calculations obtained are discussed in comparison with each other. It was found that the method by multiple correlation is the best one among three methods used here, that is, method by deviation, method by single correlation, and the above one. The variable tendency of the barometric coefficients with solar activity as pointed out by Bachelet et al. and others was not found clearly because of the short period of analysis. It will be possible to derive a significant conclusion about the long-term variation of the barometric coefficients by developing this study over a longer period.