了解绿线日冕辐射的长期演变及其与太阳黑子的关系

IF 1.8 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
Jacob Oloketuyi, Yu Liu, Abouazza Elmhamdi, Fengrong Zhu, Linhua Deng
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引用次数: 0

摘要

磁通量的出现与日冕中相关过程的复杂性之间的重要联系,可能对估算磁场活动和相关驱动机制具有重要意义。在这项研究中,我们分析了 1939 年至 2022 年期间的太阳磁场活动,涵盖太阳周期 17 到目前的周期 25。我们的研究主要基于绿色日冕强度,该强度是通过全球日冕站网络收集的观测数据计算得出的。具体来说,我们利用了斯洛伐克科学院天文研究所提供的同质化的 Fe XIV 530.3 nm 日冕发射线以及国际太阳黑子数量指数。分析采用了交叉相关和经验模式分解技术。首先,研究发现这两个指数之间存在很强的正相关性,特别是在所研究的太阳周期中系数很高。其次,经验模式分解技术揭示了本征模式函数(IMFs)的独特性质,根据它们的不同调制,突出了太阳黑子的出现和绿色日冕辐射之间的区别。事实上,这些 IMFs 很可能与磁通量绳结构密切相关,并与太阳黑子事件的出现间接相关。观测到的 MCI 和 SSN 之间的滞后可能与日冕响应时间和活动区演变之间的动态关系有关。此外,从太阳周期 17 到当前的太阳周期 25,绿色日冕指数持续下降,这可能与太阳磁场强度减弱有关。这种下降也可被视为百年格里斯伯格太阳活动周期处于下降阶段的证据。有趣的是,绿日冕指数与太阳黑子数量在很大程度上呈现出相位同步性,这表明绿日冕强度与太阳黑子数量之间错综复杂的关系可能是由加热、活跃日冕区的形成和磁通量的出现等过程驱动的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Understanding the long-term evolution of green line coronal emission and its relation to the sunspots

Understanding the long-term evolution of green line coronal emission and its relation to the sunspots

Understanding the long-term evolution of green line coronal emission and its relation to the sunspots

Significant association between flux emergence and the complexity of the involved processes in the solar corona could be substantial in estimating magnetic field activities and related driving mechanisms. In this study, we analysed solar magnetic activity in the time period between 1939 and 2022, covering solar cycles 17 to the present cycle 25. Our study was principally based on green coronal intensity, which was calculated using observations collected from a global network of coronal stations. Specifically, we utilized the homogenized Fe XIV 530.3 nm coronal emission line provided by the Astronomical Institute of the Slovak Academy of Sciences, as well as of the International Sunspot number index. The analyses were carried out using the Cross-Correlation and Empirical Mode Decomposition techniques. Firstly, the study found that there are strong and positive correlations between the two indices, with high coefficients specifically during the examined solar cycles. Secondly, the empirical mode decomposition technique reveals unique properties of the intrinsic mode functions (IMFs), highlighting distinctions between the emergence of sunspots and green coronal emissions based on their various modulations. Indeed, these IMFs are most likely closely linked to the magnetic flux rope structure and indirectly connected with the emergence of sunspot events. The observed lag between MCI and the SSN could potentially be linked to the dynamics between coronal response time and the evolutions of active regions. Furthermore, there is a steady decrease observed in the green coronal index from solar cycle 17 to the current cycle 25 that could be attributed to waning behaviour of solar magnetic field strength. This decline can also be regarded as evidence of the Centennial Gleissberg solar activity cycle during the descending phase. Interestingly, the green coronal index exhibits a significant degree of phase synchronization with sunspot numbers, suggesting that the intricate relationship between green coronal intensity and sunspot numbers can be potentially driven by processes such as heating, the formation of active coronal regions, and the emergence of magnetic flux.

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来源期刊
Astrophysics and Space Science
Astrophysics and Space Science 地学天文-天文与天体物理
CiteScore
3.40
自引率
5.30%
发文量
106
审稿时长
2-4 weeks
期刊介绍: Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered. The journal also publishes topically selected special issues in research fields of particular scientific interest. These consist of both invited reviews and original research papers. Conference proceedings will not be considered. All papers published in the journal are subject to thorough and strict peer-reviewing. Astrophysics and Space Science features short publication times after acceptance and colour printing free of charge.
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