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The Distribution Function of the Average Iron Charge State at 1 AU: From a Bimodal Wind to ICME Identification
Solar Physics ( IF 2.8 ) Pub Date : 2020-11-01 , DOI: 10.1007/s11207-020-01727-8
C. Larrodera , C. Cid

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.

中文翻译:

1 AU 处平均铁电荷状态的分布函数:从双峰风到 ICME 识别

我们的目标是研究 $\lange Q_{Fe}\rangle$ 在 1AU 处的分布函数,以检查它是否对应于双峰风。我们使用 ACE 航天器上 SWICS 仪器 20 年来的数据。我们提出双高斯函数作为拟合 $\langle Q_{Fe}\rangle$ 分布的概率分布函数。我们研究了双峰分布参数随太阳周期的演变。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。1 AU 处的 $\lange Q_{Fe}\rangle$ 显示了与太阳周期相关的双峰分布。我们的结果证实 $\langle Q_{Fe}\rangle> 12 $ 是 ICME 识别的可信赖代理和 ICME 边界定义中的可靠签名。
更新日期:2020-11-01
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