Time Variation of Cosmic Ray Intensity in the Antarctic Region

Abstract

Cosmic ray observations at Syowa Base, Antarctic, have been carried out by using a Neher type ionization chamber during 1957 and a cubical meson telescope since 1959, respectively.The atmospheric temperature effect on cosmic ray intensity thereby obtained has been investigated mainly in terms of annual change of cosmic ray diurnal variation. The results obtained are as follows:1) Annual change of cosmic ray diurnal variation is far more remarkable in the Antarctic region than in the moderate latitude.2) The best correlation between cosmic ray intensity and isobar level height is found at 50mb in the Antarctic while at 300mb in the moderate latitude.3) The amplitude of diurnal variation of 50mb isobar level height at Syowa Base is estimated from the cosmic ray data at about 12 meters in summer and about 7 meters in winter, respectively.