标题： 太阳高能粒子在多次日冕物质抛射事件中的传播 显示英文标题

标题： Propagation of Solar Energetic Particles during Multiple Coronal Mass Ejection Events

摘要： 我们研究了多次太阳爆发期间的太阳高能粒子（SEP）事件。所分析的序列分别发生在2000年11月24日至26日、2001年4月9日至13日和2005年8月22日至25日，这些序列由来自同一活动区的日冕物质抛射（CME）组成，并伴随着强烈的耀斑、EUV波以及星际（IP）射电II型和III型爆发。这些序列中的前两个太阳事件在地球附近显示出SEP增强现象，但第三个却未显示。我们观察到，在这些后续事件中，III型射电爆发在远高于早期事件的频率处停止，表明这些爆发未能到达地球附近的典型等离子体密度水平。为了解释每个序列中缺失的第三个SEP事件，我们认为，较早发射的CME及其驱动的激波要么减少了种子粒子群，从而导致粒子加速效率低下；要么改变了电子束和SEPs的传播路径，或者阻止了它们的传播，因此即使记录到了激波到达，它们在地球上也未被探测到。 显示英文摘要

摘要： We study solar energetic particle (SEP) events during multiple solar eruptions. The analysed sequences, on 24-26 November 2000, 9-13 April 2001, and 22-25 August 2005, consisted of halo-type coronal mass ejections (CMEs) that originated from the same active region and were associated with intense flares, EUV waves, and interplanetary (IP) radio type II and type III bursts. The first two solar events in each of these sequences showed SEP enhancements near Earth, but the third in the row did not. We observed that in these latter events the type III radio bursts were stopped at much higher frequencies than in the earlier events, indicating that the bursts did not reach the typical plasma density levels near Earth. To explain the missing third SEP event in each sequence, we suggest that the earlier-launched CMEs and the CME-driven shocks either reduced the seed particle population and thus led to inefficient particle acceleration, or that the earlier-launched CMEs and shocks changed the propagation paths or prevented the propagation of both the electron beams and SEPs, so that they did not get detected near Earth even when the shock arrivals were recorded.