A New Index to Describe the Relationship between Solar Extreme Ultraviolet Variation and Solar Activity

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Zhou Chen, Kecheng Zhou, Jing-Song Wang, Qiao Song, Zhihai Ouyang, Haimeng Li, Meng Zhou, Xiaohua Deng
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Abstract

Abstract In this paper, a new solar activity index based on a novel disturbance extraction method, the spectral whitening method (SWM), is introduced to process the solar EUV data on the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory. Our research suggests that the spatial information derived by SWM can well reflect the location of disturbance extraction, which is consistent with the location of the solar active region. It indicates that the disturbance extraction is effective. From AIA 094 Å to AIA 335 Å, SWM results are strongly correlated with solar radio flux F107 and the sunspot number (SSN), especially at AIA 211 Å, where the correlation coefficient reaches the maximum, while at AIA 1600 Å and AIA 1700 Å there are no detectable correlations. The proposed new solar activity index, J P AIA , has the following characteristics: (1) the new index can reflect the main variations of F107 and SSN, indicating that the index is valid; (2) the new index has higher temporal resolution, which is more conducive to the more detailed study of solar activities on short timescales; (3) the new index reveals that the solar atmosphere still has significant variability during solar minimum characterized by low F107 and SSN; (4) the new index can be used in conjunction with the new magnetospheric and ionospheric indices, which are also derived by SWM to deepen the understanding of the causal chain of space weather and promote the improvement of forecasting capabilities.
描述太阳极端紫外线变化与太阳活动关系的新指标
摘要本文提出了一种新的太阳活动指数,该指数基于一种新的干扰提取方法——光谱白化法(SWM),用于处理太阳动力学观测台大气成像组件(AIA)上的太阳EUV数据。我们的研究表明,SWM得到的空间信息能很好地反映扰动提取的位置,这与太阳活动区的位置是一致的。结果表明,扰动提取是有效的。从AIA 094 Å到AIA 335 Å, SWM结果与太阳射电通量F107和太阳黑子数(SSN)密切相关,特别是在AIA 211 Å,相关系数最大,而在AIA 1600 Å和AIA 1700 Å没有可检测到的相关。提出的新太阳活动指数J P AIA具有以下特点:(1)新指数能够反映F107和SSN的主要变化,表明该指数是有效的;(2)新指数具有更高的时间分辨率,更有利于在短时间尺度上更详细地研究太阳活动;(3)新指数表明,在太阳极小期,太阳大气仍有显著的变率,其特征是F107和SSN偏低;(4)新指数可与SWM导出的磁层和电离层新指数结合使用,加深对空间天气因果链的认识,促进预报能力的提高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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