行星际扰动与不同级别磁暴强度关系的研究  

Study on the Relationship Between Interplanetary Disturbances and Magnetic Storms With Different Intensities

作　　者：赵明现[1] 乐贵明[2] 刘玉洁[2] 

机构地区：[1]中国气象科学研究院,北京100081 [2]中国气象局国家空间天气监测预警中心

出　　处：《空间科学学报》2006年第6期421-426,共6页Chinese Journal of Space Science

摘　　要：利用1997—2004年间ACE卫星太阳风观测的时均值数据和相应的Dst指数,针对Dst_(min)≤—50nT的磁暴,分析了行星际参数(B_z,E_y,v,R_k,|B|,ε′=v_xB_z^2sin^4(θ/2))与Dst指数的相关关系．验证了E_y,B_z与Dst指数的良好相关性；按磁暴强度的不同,发现磁暴强度越大,行星际参数与磁暴强度(Dst_(min))的相关性就越好．对于中等磁暴(-100nT＜Dst_(min)≤-50nT),行星际参数与磁暴强度的相关系数不高．如果把磁暴分为两个档次,即-150nT＜DSt_(min)≤-50nT的磁暴和Dst_(min)≤-150nT的磁暴,计算结果表明,ε′与Dst指数的相关性是最好的．在诸多行星际参数中,就单一因素来说,E_y对磁暴强度影响最大,B_z对磁暴强度影响次之．The solar wind data observed by ACE satellite during 1997--2004 and the corresponding Dst indices are used to analyze the correlations of the interplanetary parameters （Bz,Ey,v,Pk,｜B｜,ε＇=vxB2zsin4（θ/2）） with the Dst indices, focusing on the magnetic storms of different intensities. The results show that Ey and Bzcorrelate well with Dst index. It is found that the larger the storm intensity is, the better the correlative relationship between interplanetary parameters and Dst indices is. As for moderate storms （-100nT〈 Dstmin≤ -50nT）, there is a low correlative relationship between interplanetary parameters and Dst indices. When dividing storms into two levels, that is -150 nT〈 Dstmin ≤ -50 nT and Dstmin ≤ -150 nT, there is a best correlative relationship between cr and Dst. As a single factor, Ey correlate best with Dst, and the inferior one is Bz.

关 键 词：太阳风 DST指数 能量耦合函数 磁暴 

分 类 号：P353[天文地球—空间物理学]