从地磁扰动分析太阳共转周期结构

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. 

AN ANALYSIS OF THE SOLAR CO-ROTATING PERIODIC STRUCTURE WITH GEOMAGNETIC DISTURBANCES DATA

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.