NOAA AR 12781 的多仪器分析：活动区表面演化与其原位太阳风特征的耦合
Multi-Instrument Analysis of NOAA AR 12781: Coupling Surface Evolution of the AR with Its In-Situ Solar Wind Signatures
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中文总结 AI 辅助
本研究利用 SDO 数据分析活动区 12781 的衰减，发现无符号磁通量减少 36.54% 而日冕辐射增加 21.96%，二者呈强反相关，并谨慎探讨了与太阳风的可能关联。
中文摘要 AI 辅助
理解光球磁场通量演化与日冕辐射之间的关系仍然是太阳物理学中的一个重要问题。我们利用太阳动力学观测站（SDO）的观测数据，研究了 NOAA 活动区 12781 在 2020 年 11 月 7 日至 11 日期间的衰减过程。日冕辐射通过大气成像组件（AIA）193 埃图像进行测量，而光球的符号磁通量和无符号磁通量则来自日震和磁成像仪（HMI）对 Fe I 6173 埃谱线的观测。无符号磁通量与平均 193 埃强度表现出强烈的反比关系，皮尔逊相关系数 r_p=-0.771，斯皮尔曼相关系数 r_s=-0.758。在五天的衰减阶段，无符号磁通量从其最大值减少了 36.54%，而日冕辐射增加了 21.96%。我们还利用估算的传播延迟，将遥感观测与 OMNI 数据库中的近地太阳风和行星际磁场测量数据进行了比较。结果表明，在 AR 12781 衰减期间，日冕辐射并未与光球磁通量直接同步变化。由于仅凭时间延迟估算无法建立直接的源区连接，因此与太阳风的可能关联被谨慎地讨论。
英文摘要
Understanding the relationship between photospheric magnetic flux evolution and coronal emission remains an important problem in heliophysics. We investigate the decay of NOAA Active Region 12781 from 7 to 11 November 2020 using observations from the Solar Dynamics Observatory (SDO). Coronal emission was measured from the Atmospheric Imaging Assembly (AIA) 193\~Å images, while the photospheric signed and unsigned magnetic flux was derived from Helioseismic and Magnetic Imager (HMI) observations of the FeĨ 6173\~Å line. The unsigned magnetic flux and mean 193\~Å intensity showed a strong inverse relationship, with Pearson and Spearman correlation coefficients of $r\_p=-0.771$ and $r\_s=-0.758$, respectively. During the five-day decay phase, the unsigned magnetic flux decreased by 36.54\\% from its maximum value, while the coronal emission increased by 21.96\\%. We also compared the remote-sensing observations with near-Earth solar-wind and interplanetary magnetic-field measurements from the OMNI database using an estimated propagation delay. The results show that the coronal emission did not vary directly with the photospheric magnetic flux during the decay of AR\~12781. The possible association with the solar wind is discussed cautiously because a direct source connection cannot be established from the time-delay estimate alone.
发表机构
- Madras Christian College（马德拉斯基督教学院）
- New Mexico State University（新墨西哥州立大学）
机构由 AI 辅助整理，请以论文原文为准。
