磁暴与电离层总电子含量扰动相关关系的统计研究

Statistical study on correlation between geomagnetic storms and ionospheric total electric content disturbance

利用1996～2004年中纬度地区的地磁和电离层总电子含量（TEC）数据，对发生的119次磁暴期间电离层TEC扰动与地磁扰动的相关关系进行统计研究，详细分析磁暴期间TEC发生扰动的频次以及TEC扰动与磁暴发生的先后关系，不同磁暴强度与TEC扰动频次的相关性以及磁暴发生的季节、地方时与TEC扰动频次的相关性。结果表明：有99．1％的磁暴会伴随发生TEC扰动，其中TEC超前扰动占71．4％，TEC滞后扰动占27．7％；急始磁暴与TEC超前扰动的相关性为80％，TEC负相扰动与超前扰动的相关性为100％；中烈磁暴和强烈磁暴下TEC发生扰动的概率为100％，磁暴和TEC扰动在秋季出现的频次最高，在春季出现的频次最低；磁暴次数年变化与TEC扰动次数年变化的相关系数为0．7632，日变化相关系数为0．7399。

The correlation between ionospheric and geomagnetic variations during the geomagnetic storms was studied statistically. The geomagnetic data and ionospheric total electric content （TEC） data were observed in mid-latitude area from 1996 to 2004. The occurrence rate of TEC disturbance, the time of magnetic storms and TEC disturbance appearing, the correlation between magnetic disturbance intense and TEC disturbance occurrence rate, and the correlations among the seasons and local time （LT） of magnetic disturbance and TEC disturbance were analyzed. The results show that the TEC disturbance occurrence rate during magnetic storms is 99.1%, in which TEC disturbance occurring earlier than magnetic storm is 71.4%, and later than magnetic storm is 27.7%. The correlation coefficient between sudden commence magnetic storm and leading-forward TEC disturbance is 80%, the correlation coefficient between negative phase TEC disturbance and the leading-forward TEC disturbance is 100%. The occurrence rate of TEC disturbance of middle strong （MS） storms and strong storms is 100%. The occurrence rate of magnetic storms and TEC disturbance is the highest in autumn and the lowest in spring. The annual times correlation coefficient between magnetic storms and TEC disturbance is 0.763 2, and the daily times correlation coefficient is 0.739 9.