标题： 直接比较日冕和太阳风元素分馏 显示英文标题

标题： Directly comparing coronal and solar wind elemental fractionation

摘要： 随着太阳风传播穿过日球层，动力学过程不可逆地抹去了近太阳加热和加速过程的特征。 然而，太阳风的元素分馏在传输过程中不应发生变化，这使其成为这些过程的理想示踪剂。 我们的目标是直接验证太阳风元素分馏是否反映了日冕源区分馏，无论是在同一日冕源区内还是跨不同的日冕源区之间。 采用反向映射方案来预测由先进成分探测器（ACE）测量的太阳风起源于日冕何处。 然后将通过Hinode极紫外成像光谱仪（EIS）在源区测量的日冕成分与就地太阳风成分进行比较。 在每小时的时间尺度上，日冕和太阳风成分之间没有明显的相关性。 相反，在各个源区内，分馏值的分布在这两者中相似，但不同源区之间的分布有显著重叠。 匹配的分布直接证实了作为等离子体从日冕传播到太阳风的过程中元素组成得到了保留，进一步验证了其作为加热和加速过程示踪剂的有效性。 源区间分馏值的重叠意味着无法仅通过比较太阳风和日冕成分测量结果来识别太阳风源区，但可以用于验证与预测的航天器-日冕连接的一致性。 显示英文摘要

摘要： As the solar wind propagates through the heliosphere, dynamical processes irreversibly erase the signatures of the near-Sun heating and acceleration processes. The elemental fractionation of the solar wind should not change during transit however, making it an ideal tracer of these processes. We aimed to verify directly if the solar wind elemental fractionation is reflective of the coronal source region fractionation, both within and across different solar wind source regions. A backmapping scheme was used to predict where solar wind measured by the Advanced Composition Explorer (ACE) originated in the corona. The coronal composition measured by the Hinode Extreme ultraviolet Imaging Spectrometer (EIS) at the source regions was then compared with the in-situ solar wind composition. On hourly timescales there was no apparent correlation between coronal and solar wind composition. In contrast, the distribution of fractionation values within individual source regions was similar in both the corona and solar wind, but distributions between different sources have significant overlap. The matching distributions directly verifies that elemental composition is conserved as the plasma travels from the corona to the solar wind, further validating it as a tracer of heating and acceleration processes. The overlap of fractionation values between sources means it is not possible to identify solar wind source regions solely by comparing solar wind and coronal composition measurements, but a comparison can be used to verify consistency with predicted spacecraft-corona connections.