arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1504.00709astro-ph.SR
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与活动区外暗条爆发有关的大太阳高能粒子事件

Large Solar Energetic Particle Events Associated with Filament Eruptions Outside of Active Regions

N. Gopalswamy, P. Makela, S. Akiyama, S. Yashiro, H. Xie, N. Thakur, S. W. Kahler

摘要:

我们报告了四个大的灯丝喷发(FE)从太阳活动周23日和24日,与大的太阳高能粒子(SEP)事件和行星际II型射电爆发。喷发后的拱廊对应于大多数C级软X射线增强,但M1.0耀斑与一个事件。然而,相关的日冕物质抛射(CME)速度很快(速度约为1000 km/s),在日冕物质抛射的视野中表现为晕状CME。行星际II型射电爆发发生在很宽的波长范围内,表明整个日光层内部存在强烈的激波。没有公制II型爆发出现在三个事件,表明冲击形成超过2至3 Rs。在一种情况下,有一个公制II型爆发与低的起始频率,表明冲击波形成高度约为2 Rs。FE相关SEP事件在10至100 MeV范围内确实具有较软的光谱(光谱指数大于4),但也有其他光谱指数>/=4的低强度SEP事件。其中一些事件可能是FE-SEP事件,但在文献中未进行分类,因为它们发生在活动区域附近。有些肯定与大的活动区耀斑有关,但激波形成高度很大。我们确实发现耀斑和复杂的III型爆发持续时间在这些大型SEP事件中的作用减弱。快速CME和冲击形成在更大的距离从太阳似乎是FE相关的SEP事件的主要特征。

英文摘要:

We report on four large filament eruptions (FEs) from solar cycles 23 and 24 that were associated with large solar energetic particle (SEP) events and interplanetary type II radio bursts. The post-eruption arcades corresponded to mostly C-class soft X-ray enhancements, but an M1.0 flare was associated with one event. However, the associated coronal mass ejections (CMEs) were fast (speeds about 1000 km/s) and appeared as halo CMEs in the coronagraph field of view. The interplanetary type II radio bursts occurred over a wide wavelength range indicating the existence of strong shocks throughout the inner heliosphere. No metric type II bursts were present in three events, indicating that the shocks formed beyond 2 to 3 Rs. In one case, there was a metric type II burst with low starting frequency indicating a shock formation height of about 2 Rs. The FE-associated SEP events did have softer spectra (spectral index greater than 4) in the 10 to 100 MeV range, but there were other low-intensity SEP events with spectral indices >/=4. Some of these events are likely FE-SEP events, but were not classified so in the literature because they occurred close to active regions. Some were definitely associated with large active region flares, but the shock formation height was large. We definitely find a diminished role for flares and complex type III burst durations in these large SEP events. Fast CMEs and shock formation at larger distances from the Sun seem to be the primary characteristics of the FE-associated SEP events.

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