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.
出处
《空间科学学报》
CAS
CSCD
北大核心
2006年第6期421-426,共6页
Chinese Journal of Space Science
关键词
太阳风
DST指数
能量耦合函数
磁暴
Solar wind, Dst index, Energy coupling function, Magnetic storms
