地磁感应电流水平与行星际扰动的关系分析  

Analysis on the Relationship between Amplitudes of Geomagnetically Induced Currents and Interplanetary Disturbances

作　　者：刘连光[1,2,3] 杜冠男[1,2] 王开让[1,2] 

机构地区：[1]华北电力大学电气与电子工程学院,北京102206 [2]华北电力大学新能源电力系统国家重点实验室,北京102206 [3]华北电力大学电气与电子工程学院空间天气学国家重点实验室,北京100190

出　　处：《科学技术与工程》2013年第20期5741-5747,共7页Science Technology and Engineering

基　　金：国家高技术研究发展计划(863)(2012AA121005);国家科技部国际合作计划项目(2010DFA64680);北京市教委中央在京高校共建项目(YB20101007901)资助

摘　　要：地磁感应电流(geomagnetically induced currents,简称GIC)取决于地磁场变化。地磁场变化受电离层、磁层和行星际等各空间的扰动变化所驱动。认识GIC与空间扰动参数的关系可尝试预测、预报GIC及其影响。利用斯皮尔曼相关系数分析了1999—2005年间芬兰输气管线GIC数据与ACE卫星记录的行星际扰动参数(Bs,Ey,V,Pk,|B|,ε)的相关性。结果表明,这些参数与GIC都具有较好的相关性;其中,Pk和|B|是与GIC相关性最好的两个参数。在大磁暴GIC事件中V的相关度最高,特大磁暴GIC事件中Ey相关度最好。如果把GIC分成三个级别,即GIC≥10A,GIC≥20A,GIC≥30A,相关性最好的参数分别为Ey,Pk和|B|。统计GIC事件的行星际源发现,所有事件的行星际源中包含鞘层结构(SH)的比例高达82.8%,30A以上GIC的行星际源都包含有磁云结构(MC)。综合分析表明,预测GIC的影响可以考虑这些条件。Geomagnetically induced currents （GIC） are caused by the changes of geomagnetic field. The changing magnetic fields originate from the magnetosphere, ionosphere and interplanetary space. Therefore, recognizing the relationship between GIC and spatial disturbances is significant for the prediction of GIC. We used spearman correlation index to analyze the correlations of GIC in Finland gas line during 1999-2005 and the interplanetary parameters （Bs, Ey, V, Pk, ｜B｜, ε） observed by ACE satellite. The results show that there is good correlation between GIC and these parameters, while Pk and ｜B｜ correlate best with GIC. In large magnetic storm, V correlates best with GIC while in extreme magnetic storm, Ey correlates best with GIC. When GIC〉10A, GIC〉20A, GIC〉30A, Pk, Ey and ｜B｜ is the most closely one separately. Statistics on interplanetary drivers of GIC events shows that proportion of sheath （SH） is 82.8% and the interplanetary drivers of GIC above 30A all include magnetic cloud （MC）. Comprehensive analysis indicates that we can considering these conditions when we want to forecast GIC.

关 键 词：地磁感应电流 行星际参数 相关性 GIC预报 

分 类 号：P353.8[天文地球—空间物理学]