第23太阳活动周太阳极紫外辐射与磁暴相关性分析

统计第23个太阳活动周内中等及以上强度（Dst_min<-50nT）的磁暴事件，线性拟合分析磁暴主相DDst_min和达到DDst_min前一个表征太阳极紫外辐射强度的F_10.7之间的相关性.结果表明:随着太阳极紫外辐射增强，DDst_min<-50nT的磁暴出现的总数增多，在弱、中等和强太阳极紫外辐射条件下，其数量分别为56，84和85；随着太阳极紫外辐射增强，强磁暴（-200nT ≤ Dst_min<-100nT）和大磁暴（Dst_min<-200nT）发生的数量和相对发生率呈增长趋势，尤其是大磁暴数目（1，4，12）和相对发生率（1.79%，4.76%，14.12%）明显呈增长趋势；大磁暴（|Dst_min|）与太阳极紫外辐射（F_10.7）之间存在中度正相关关系，其相关系数为0.532，并且主要体现在大磁暴（|Dst_min|）与强太阳极紫外辐射（F_10.7）之间的中度正相关性，其相关系数为0.582.大磁暴与强太阳极紫外辐射之间的相关性可为空间天气预报提供参考依据. 

Correlation Analysis between Magnetic Storms and Solar Extreme Ultraviolet Radiation during the 23rd Solar Cycle

The statistics of magnetic storms with moderate and higher intensity during the 23rd solar cycle are presented, and investigated the correlation by linear analysis between the intensity of the magnetic storm Dst_min and the solar Extreme Ultraviolet Radiation (EUV) intensity by using the observation of F_10.7 index before the maximum of the storm main phase. Our statistical analysis results show that during the 23rd solar cycle:firstly, with an increase in solar EUV input, the number of moderate or higher intensity storms increases. There are 56 moderate or higher intensity storms under low solar extreme ultraviolet radiation activity, 85 storms under intermediate solar extreme ultraviolet radiation activity, and 80 events under high solar extreme ultraviolet radiation activity. Secondly, with increasing EUV input, the number and the probability of strong (-200nT ≤ Dst_min<-100nT) and big (Dst_min< -200nT) storms occurring also show an increasing trend, especially the number (1, 4, 12) and the probability (1.79%, 4.76%, 14.12%) of big storms. Thirdly, there is a moderate positive correlation of big storm (|Dst_min|) with F_10.7, where the correlation coefficient is 0.532, and the correlation of big storm (|Dst_min|) with F_10.7 is more significantly under high solar extreme ultraviolet radiation activity, where the coefficient is 0.582. Our results that there exists the moderate positive correlation of big storm with high solar extreme ultraviolet radiation activity can provide foundation information for space weather forecasting.