太阳活动高低年电离层TEC变化特性分析

Analysis ofionospheric TEC variation characteristics in solar activity years

为了进一步研究电离层变化特性受不同太阳活动强度影响的问题,提出太阳活动高低年对比分析的方法,研究5个特定点的电离层TEC的变化特性;重点对太阳活动高低年的TEC半年变化、季节变化以及周日变化进行分析。结果表明:太阳活动强度影响TEC数值变化的同时,还影响其半年变化和季节变化特性;春秋分季节是出现峰值的高峰期,TEC半年变化强度与太阳活动成正比;太阳活动强度对季节异常现象有一定影响,太阳活动高年季节变化更显著,0°N^-20°N是TEC季节异常的活跃范围;全球TEC峰值呈自东向西周日性运动,通过2年数据的自相关分析可以明显看出其变化周期为24h,未受到太阳活动高低年影响。

In order to further study on the influence of solar activity intensity on ionospheric variation characteristics,the paper proposed the method of comparative analysis on solar activity intensity in the high and low solar activity years,and studied the ionospheric TEC variation characters of 5specific points;mainly annalyzed the TEC semiannual,seasonal and diurnal variations of both high and low ionospheric activity years.Result showed that the intensity of solar activity would affect not only the value variation,but also its semiannual and seasonal variation;the maximum values of TEC would mainly appear in equinox seasons,and the intensity of TEC variation would be proportional to that of solar activity;the TEC seasonal variation would be affected by the intensity of solar activity and more significant in high solar activity years,and the active range usually in 0°N^-20°N;the change of the global TEC maximum values would occur diurnal from the east to the west,and the data autocorrelation analysis of two years indicated that the variation period would turn out to be 24 h,unaffected by the high or low solar activity years.