论文标题
太阳能轨道上的第一个逐渐的太阳能粒子事件具有增强的3HE丰度
The first gradual solar energetic particle event with enhanced 3He abundance on Solar Orbiter
论文作者
论文摘要
冠状质量弹出（CME）驱动的冲击渐变式太阳能粒子（SEP）事件中3HE丰度增强的起源仍然在很大程度上无法解释。已经提出了两种机制 - 在星际空间中残留的火炬物质的重新加速和电晕伴随活性。我们探索了第一个逐渐的SEP事件，其太阳能轨道观察到的3HE丰度增强。该活动始于2020年11月24日，与相对快速的Halo CME相关。在活动期间，航天器的天气为0.9 au。该事件的平均3HE/4HE丰度比是冠状或太阳风值高24倍，而3HE强度的时机与其他物种相似。我们检查了可用的成像，无线电观测和与CME源的航天器磁连接。似乎增加了3HE的最可能原因是剩余的3HE离子，该离子是在2020年11月17日至23日长期3he-rich SEP的长时间剩余的。
The origin of 3He abundance enhancements in coronal mass ejection (CME)-driven shock gradual solar energetic particle (SEP) events remains largely unexplained. Two mechanisms have been suggested - the re-acceleration of remnant flare material in interplanetary space and concomitant activity in the corona. We explore the first gradual SEP event with enhanced 3He abundance observed by Solar Orbiter. The event started on 2020 November 24 and was associated with a relatively fast halo CME. During the event, the spacecraft was at 0.9 au from the Sun. The event averaged 3He/4He abundance ratio is 24 times higher than the coronal or solar wind value, and the 3He intensity had timing similar to other species. We inspected available imaging, radio observations, and spacecraft magnetic connection to the CME source. It appears the most probable cause of the enhanced 3He abundance are residual 3He ions remaining from a preceding long period of 3He-rich SEPs on 2020 November 17-23.
