ACE/SWICS观测到的太阳风分馏在一个太阳周期内的变化和对创世纪任务结果的影响
Variations in solar wind fractionation as seen by ACE/SWICS over a solar cycle and the implications for Genesis Mission results
摘要：
我们使用ACE/SWICS的元素组成数据比较的变化，太阳风分馏的SWICS测量的最后一个太阳活动高峰期（1999年至2001年），太阳活动极小期（2006年至2009年）和期间的起源航天器收集太阳风（2001年底至2004年初）。我们区分我们的分析方面的太阳风制度（即起源于流间或日冕洞流，或日冕物质抛射）。将丰度归一化为低FIP离子镁以揭示归一化为高FIP离子时不明显的相关性。我们发现，相对于镁，其他低FIP元素是可测量的分馏，但分馏的程度并没有显着变化的太阳周期。对于高FIP离子，分馏在太阳周期的变化是显着的：最大的Ne/Mg和C/Mg，O/Mg，和最少的He/Mg。当丰度比作为太阳风速度的函数进行检查时，我们发现了很强的相关性，与显着的观察，分馏的程度遵循质量依赖的趋势。我们讨论了纠正成因样本返回结果的光球丰度的影响。
英文摘要：
We use ACE/SWICS elemental composition data to compare the variations in solar wind fractionation as measured by SWICS during the last solar maximum (1999-2001), the solar minimum (2006-2009) and the period in which the Genesis spacecraft was collecting solar wind (late 2001 - early 2004). We differentiate our analysis in terms of solar wind regimes (i.e. originating from interstream or coronal hole flows, or coronal mass ejecta). Abundances are normalized to the low-FIP ion magnesium to uncover correlations that are not apparent when normalizing to high-FIP ions. We find that relative to magnesium, the other low-FIP elements are measurably fractionated, but the degree of fractionation does not vary significantly over the solar cycle. For the high-FIP ions, variation in fractionation over the solar cycle is significant: greatest for Ne/Mg and C/Mg, less so for O/Mg, and the least for He/Mg. When abundance ratios are examined as a function of solar wind speed, we find a strong correlation, with the remarkable observation that the degree of fractionation follows a mass-dependent trend. We discuss the implications for correcting the Genesis sample return results to photospheric abundances.
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