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利用120°E子午线上的GPSTEC数据,计算了1996～2004年间的等效电离层全球电子总含量(GEC).应用偏相关方法分析了GEC与太阳活动指数F10.7,以年为基频的季节因子之间的相关性,发现GEC与F10.7,年变化和半年变化因子之间均存在较强的相关性.据此,构建了一个由太阳活动指数和季节因子共同驱动的GEC经验模式,并考察了太阳活动指数的修正对建模效果的影响.结果表明GEC的变化主要由太阳活动周变化,年变化和半年变化3种分量构成,其中太阳活动周变化由太阳活动指数控制,其变化幅度最大;年变化与半年变化的幅度也受太阳活动指数调制,半年变化的幅度略大于年变化幅度.此外,经过对比分析,文中构建的GEC经验模型优于Afraimovich等人提出的GEC经验模型.
Using the GPSTEC data on the 120 ° E meridian, the global equivalent total ionosphere (GEC) of the ionosphere between 1996 and 2004 was calculated.The partial correlation method was used to analyze the relationship between GEC and solar activity index F10.7 We found that there is a strong correlation between GEC and F10.7, annual variation and six-year change factor.Accordingly, a GEC empirical mode driven by solar activity index and seasonal factor is constructed , And examined the effect of the correction of solar activity index on the modeling effect.The results showed that the changes of GEC mainly consisted of three components: the solar activity week change, the annual change and the semi-year change, and the solar week change was controlled by the solar activity index, The amplitude of annual change and six-year change is also modulated by the solar activity index, and the amplitude of six-year change is slightly larger than the annual variation range.Furthermore, after comparative analysis, the GEC empirical model built in this paper is superior to the GEC empirical model proposed by Afraimovich et al .