1 AU平均铁电荷态的分布函数：从双峰风到ICME识别
The distribution function of the average iron charge state at 1 AU: from a bimodal wind to ICME identification
摘要：
我们的目标是调查$\langle Q_{Fe}\rangle$在1AU的分布函数，以检查它是否对应于双峰风。我们使用的数据从SWICS仪器上的ACE飞船沿20年。我们提出了双高斯函数作为概率分布函数，适合$\langle Q_{Fe}\rangle$分布。我们研究了双峰分布参数随太阳活动周的演化。我们将样本的异常值与现有的ICME目录进行比较，并确定新的ICME。在1天文单位的$\langle Q_{Fe}\rangle$显示出与太阳活动周期有关的双峰分布。我们的研究结果证实，$\langle Q_{Fe}\rangle> 12 $是一个值得信赖的代理ICME识别和ICME边界定义中的可靠签名。
英文摘要：
We aim to investigate the distribution function of $\langle Q_{Fe}\rangle$ at 1AU to check if it corresponds to a bimodal wind. We use data from SWICS instrument on board the ACE spacecraft along 20 years. We propose the bi-Gaussian function as the probability distribution function that fits the $\langle Q_{Fe}\rangle$ distribution. We study the evolution of the parameters of the bimodal distribution with the solar cycle. We compare the outliers of the sample with the existing catalogues of ICMEs and identify new ICMEs. The $\langle Q_{Fe}\rangle$ at 1 AU shows a bimodal distribution related to the solar cycle. Our results confirm that $\langle Q_{Fe}\rangle> 12 $ is a trustworthy proxy for ICME identification and a reliable signature in the ICME boundary definition.
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