通过对比两次快速晕状日冕物质抛射(CME)事件,分析相应的日面和行星际的观测资料,发现源区距离冕洞较远的CME引起了极强的太阳高能粒子(Solar Energetic Particle,SEP)事件,而源区非常靠近冕洞的CME则没有引起大的SEP事件.该结果表明,冕洞可能对CME形成SEP事件有阻碍作用.继而分析1997~2003年所有爆发在冕洞边缘的快速晕状CME,发现源区离冕洞距离小于0.2Rs(太阳半径)的CME均没有引起大的SEP事件.从而进一步证实了冕洞可能对邻近CME形成大SEP事件有影响,它阻碍SEP事件的形成.最后讨论了冕洞阻碍CME形成大SEP事件的可能原因.
By comparing and analyzing the solar and interplanetary data of two typical fast halo Coronal Mass Ejections (CMEs), we have found that the event far away from Coronal Holes (CHs) caused a great Solar Energetic Particle (SEP) event, but the event very close to CHs did not cause a major SEP event. This result reveals that coronal holes may suppress the production of SEPs. Then by investigating all fast halo CMEs close to CHs from 1997 to 2003, it is found that none of the CMEs produced a major SEP event when the surface distance between the CME and coronal holes is less than 0.2Rs. The result further proves that the CHs may have effects against the CME producing SEPs. The reasons why CHs affect CMEs in SEP acceleration are briefly addressed finally.