It is generally noticed, that there is seven days period in the atmospheric temperature, say, the local word “Sankan-Sion.” (the meaning of it is “Three cald days and four warm days”) The existence of such a period and the mechanism of it were researched by means of the correlation method proposed by one of authors and K. Husimi, and the result of which summerized as follows.
In practise there exists a free oscillation of seven days period in the atmospherfc temperature caused by the coupling of temperature and pressure of the atomsphere, and the above period is recalled by the resonance of such oscillation and the over harmonics of inner effect on pressure.