A Remark on the Eleven-years-period of the Sun-spot

[摘要] The result of the correlation periodgram analysis of eleven year period of sun spot by Mr. Tomizawa and Mr. Simose was analysed and found that there are two sorts of period in it, i. e., undamped and damped. This suggests that the eleven years periods is the resonance phenomena of the periodicity due to the internal mechanism of the sun and the effect of the external effect of eleven year period such as Jupiter, though it is not conclusive.There are a great number of investigations on the eleven year period of sun spot. Recently, Mr. Tomizawa and Mr. Simose analysed the eleven year period by the method of correlation proposed by author, and they found that the period is 11.47 year. But the results of them tells us much more than this though they are not pointed out. The curve of them, that is, the relation between r(t) and t where r(t) is the correlatlon coefficient between the number of sun spot in a year and the number after t year, shows damped oscillation, but the damping is ceased after few oscillation. This means that the eleven year period is built up two parts, i. e., damped and undamped. The characteristic constant of these periods are follows.the theory of the origin of eleven year period can be divided roughly into two class. One of them results to the internal mechanism of the sun, such as pulsation and the other to the external effect, such as planet. But the result of the present analysis suggest that the both theory is collet. Namely, the eleven year period is the resonance phenomena of the periodicity due to the internal mechanism of the sun and the external effect such as Jupiter though it is not conclusive.

[学科分类] 大气科学