AN ANALYSIS OF THE SOLAR CO-ROTATING PERIODIC STRUCTURE WITH GEOMAGNETIC DISTURBANCES DATA
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摘要: 本文运用相关、功率谱等数字信号处理方法对20周太阳风速度和地磁扰动进行比较,得出两者反映的太阳共转周期结构十分相似.且用1900—1979年的地磁C9指数进行了自相关分析,发现在相当长的时间中,地磁扰动存在13天、27天的周期成份,说明日冕上可能具有某种固有的分布结构,通过不同的太阳活动周的比较,说明太阳活动水平及黑子面积南北半球不对称都对地磁C9指数能否明显反映日冕上固有分布结构的活动和发展有影响.Abstract: Data of solar wind speed and geomagnetic disturbances in the 20th solar cycle are statistically compared. There seems to be a similarity of the corotating periodic structure deduced from both sets of data. An autocorrelation analysis of geomagnetic index C9 of 1900-1979 shows that in a fairly long period there exist 13-day and 27-day periodic components. It can be concluded that on the corona, there might be some inherent distribution structures. The reflection of such structures by C9 index is affected by the level of solar activety and North-South asymmetry of sunspot area.
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