Signature and escape of highly fractionated plasma in an active region
Signature and escape of highly fractionated plasma in an active region
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活性区域中高度分级等离子体的特征和逃逸
DOI：
10.1093/mnras/stab2681
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发表时间：
2021
影响因子：
4.8
通讯作者：
Brooks D
中科院分区：
文献类型：
--
作者：
Brooks D
准确预报空间天气需要了解太阳高能粒子和爆发事件的来源区域。最近的工作已经将2014年1月的几个主要SEP事件与主机活动区（AR 11944）的特定特征联系起来。特别是，等离子体成分的测量和周围的热，日冕环的活动区的核心足点能够解释后来测量的值在现场的风航天器。由于SEP和太阳风之间的元素组成存在重要差异，Si/S元素丰度比的大小成为SEP种子种群和太阳风源位置的关键诊断。我们试图了解这些结果是否是其他活跃地区的典型结果，即使它们不是太阳能风能或SEP生产。在本文中，我们使用一种新的成分分析技术，连同一个演变的磁场模型，在一个新的方法来调查一个典型的太阳活动区（AR 11150），并确定高度分馏（高Si/S丰度比）等离子体的位置。局限在冠状环足点附近的物质，如AR 11944，在这种情况下已经扩展到AR外围，显示出签名，并且可以从AR边界处重新连接打开的磁场中释放出来。由于闭合场环在AR边界处打开的基本特征是活跃区域的典型特征，因此该过程可能是普遍的。
Accurate forecasting of space weather requires knowledge of the source regions where solar energetic particles (SEP) and eruptive events originate. Recent work has linked several major SEP events in 2014, January, to specific features in the host active region (AR 11944). In particular, plasma composition measurements in and around the footpoints of hot, coronal loops in the core of the active region were able to explain the values later measuredin situby theWindspacecraft. Due to important differences in elemental composition between SEPs and the solar wind, the magnitude of the Si/S elemental abundance ratio emerged as a key diagnostic of SEP seed population and solar wind source locations. We seek to understand if the results are typical of other active regions, even if they are not solar wind sources or SEP productive. In this paper, we use a novel composition analysis technique, together with an evolutionary magnetic field model, in a new approach to investigate a typical solar active region (AR 11150), and identify the locations of highly fractionated (high Si/S abundance ratio) plasma. Material confined near the footpoints of coronal loops, as in AR 11944, that in this case have expanded to the AR periphery, show the signature, and can be released from magnetic field opened by reconnection at the AR boundary. Since the fundamental characteristics of closed field loops being opened at the AR boundary is typical of active regions, this process is likely to be general.
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