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Solar Activity and Variation of Geomagnetic Disturbance

Sun Kai1, Cheng Xin-hua1, Ming Yue-hong1, Jing Ju-ling2, Wang Xu Li2, Zhi-ping2, Li Hong2   

  1. 1. Dept. of Geophysics, Peking University;
    2. Beijing Planetarium
  • Received:1983-09-02 Revised:1900-01-01 Online:1984-08-24 Published:1984-08-24

Abstract: The events of which geomagnetic indices C9s are all larger than L (L is a constant) are noticed. The number of times of the events in a year is taken to express the level of geomagnetic disturbance of the year. Six cases are studied:L=3, 4 and 5; each of them is subdivided into two subcases: recurrent events and general events.The method of the curve fitting with piecewise polynomials is used to derive an averaged experimental relationship f(R) between the number of times in a year Ck and the sunspot relative number Rk (k is the order of the years from 1980 to 1979). Then, △k = Ck - fk (fk = f(Rk)) are calculated. The result shows that: 1, for the 'solar cycles', each of which begins at he year four years before the minimum of the cor responding solar cycle, the signs of the average values of △k alternate, ('sign alternating' fule +,-,+,-,......); 2. the 'sign alternating' rule oceurs in all the six subcases. It is mostly likely that the rule is caused by thereversal of the solar polar fields. After a further dividing of the 'cycles', every cycle has own dispersity (o) about its averaged △, . The sequence of a shows a long term period of about 70 years.