Disparity among low first ionization potential elements
Disparity among low first ionization potential elements
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低第一电离势元素之间的差异
DOI：
10.1051/0004-6361/201833454
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发表时间：
2018
影响因子：
6.5
通讯作者：
Wimmer-Schweingruber
中科院分区：
文献类型：
--
作者：
Heidrich-Meisner;Berger;Wimmer-Schweingruber
上下文太阳风的元素组成不同于太阳光球的组成。第一电离势（FIP）低的元素出现增强相比，O在太阳风相对于各自的光球丰度。这种所谓的FIP效应在慢太阳风和冕洞风中是不同的。然而，在相同的等离子体条件下，对于具有类似FIP的元素，如Mg，Si和Fe，可比较的增强是expected.AimsWe仔细检查的假设，即FIP效应总是类似于不同的低FIP元素，即Mg，Si和Fe.MethodsHere，我们研究了低FIP元素的FIP效应对随时间变化的O 7 +/O 6+电荷状态比的依赖性，就是太阳活动周期，太阳风类型。此外，我们为了观察到的FIP比相对于O 7 +/O 6+电荷态比到bin和分析分别为每个O 7 +/O 6+电荷态比bin. ResultsFIP比的Mg，Si，Fe的各自的分布我们观察到，FIP效应表现出相同的质量每年的行为为Mg和Si，而Fe在太阳活动最大值及其下降阶段表现出显着的差异。在每一年中，Mg和Si的FIP效应总是随着O 7 +/O 6+电荷态比的增加而增加，但对于高的O 7 +/O 6+电荷态比，Fe的FIP效应表现出质的不同行为。在2001-2006年期间，Fe FIP比不是随着O 7 +/O 6+电荷状态比而增加，而是呈现宽峰或平台。此外，FIP分布每O 7 +/O 6+电荷态仓是显着更广泛的Fe比Mg和Si.ConclusionsThese意见支持的结论是，元素分馏只有部分由FIP决定。特别是，定性差异的行为与增加O 7 +/O 6+之间的电荷态比Fe一方面和Mg和Si另一方面还没有很好地解释分馏模型。
Context. The elemental composition of the solar wind differs from the solar photospheric composition. Elements with low first ionization potential (FIP) appear enhanced compared to O in the solar wind relative to the respective photospheric abundances. This so-called FIP effect is different in the slow solar wind and the coronal hole wind. However, under the same plasma conditions, for elements with similar FIPs such as Mg, Si, and Fe, comparable enhancements are expected.AimsWe scrutinize the assumption that the FIP effect is always similar for different low FIP elements, namely Mg, Si, and Fe.MethodsHere we investigate the dependency of the FIP effect of low FIP elements on the O7+/O6+charge state ratio depending on time, that is the solar activity cycle, and solar wind type. In addition, we order the observed FIP ratios with respect to the O7+/O6+charge state ratio into bins and analyze separately the respective distributions of the FIP ratio of Mg, Si, and Fe for each O7+/O6+charge state ratio bin.ResultsWe observe that the FIP effect shows the same qualitative yearly behavior for Mg and Si, while Fe shows significant differences during the solar activity maximum and its declining phase. In each year, the FIP effect for Mg and Si always increases with increasing O7+/O6+charge state ratio, but for high O7+/O6+charge state ratios the FIP effect for Fe shows a qualitatively different behavior. During the years 2001–2006, instead of increasing with the O7+/O6+charge state ratio, the Fe FIP ratio exhibits a broad peak or plateau. In addition, the FIP distribution per O7+/O6+charge state bin is significantly broader for Fe than for Mg and Si.ConclusionsThese observations support the conclusion that the elemental fractionation is only partly determined by FIP. In particular, the qualitative difference in behavior with increasing O7+/O6+charge state ratio between Fe on the one hand and Mg and Si on the other hand is not yet well explained by models of fractionation.
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DOI：
10.1088/0004-637x/709/2/993
发表时间：
2010
期刊：
The Astrophysical Journal
影响因子：
--
作者：
S. Pucci;Ø. Lie;R. Esser
通讯作者：
R. Esser
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影响因子：
2.8
作者：
W. H. White
通讯作者：
W. H. White
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DOI：
10.3847/0004-637x/831/2/160
发表时间：
2016
期刊：
The Astrophysical Journal
影响因子：
--
作者：
R. Dahlburg;J. Laming;B. Taylor;K. Obenschain
通讯作者：
K. Obenschain
影响因子：
2.9
作者：
FELDMAN, U
通讯作者：
FELDMAN, U
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DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
P. Pilleri;D. Reisenfeld;T. Zurbuchen;S. Lepri;P. Shearer;J. Gilbert;R. Steiger;R. Wiens
通讯作者：
R. Wiens