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On the Rotation of the Solar Chromosphere
Xu,Jing-Chen1,2,3; Gao,Peng-Xin1,2,3; Shi,Xiang-Jun1,2,3
2020-10-01
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume902Issue:1
AbstractAbstract Rotation is a significant characteristic of the Sun and other stars, and it plays an important role in understanding their dynamo actions and magnetic activities. In this study, the rotation of the solar chromospheric activity is investigated from a global point of view with an over 40 yr Mg ii index. We determined the time-varying rotational period lengths (RPLs) with the synchrosqueezed wavelet transform, which provides high temporal and frequency resolution; furthermore, we compared the RPLs with the photospheric and coronal RPLs obtained from the sunspot numbers and the 10.7 cm radio flux data. The significance of the RPLs is taken into consideration. We found that the RPLs of the chromosphere exhibit a downward trend, as do those of the photosphere and corona; in addition, their RPLs at the recent four solar maxima also show a declining trend. This suggests that the rotation of the solar atmosphere has been accelerating during the recent four solar cycles, which is inferred to be caused by the declining strength of solar activity. The variations of the solar atmospheric RPLs show periodicities of multiple harmonics of the solar cycle period, and it is modulated by the solar activity cycle.
KeywordSolar activity Solar rotation Solar chromosphere
DOI10.3847/1538-4357/abb5b7
Language英语
WOS IDIOP:0004-637X-902-1-abb5b7
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/62100
Collection中国科学院国家天文台
Corresponding AuthorXu,Jing-Chen
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People's Republic of China; jcxu@ynao.ac.cn
2.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100012, People's Republic of China
3.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People's Republic of China
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Xu,Jing-Chen,Gao,Peng-Xin,Shi,Xiang-Jun. On the Rotation of the Solar Chromosphere[J]. The Astrophysical Journal,2020,902(1).
APA Xu,Jing-Chen,Gao,Peng-Xin,&Shi,Xiang-Jun.(2020).On the Rotation of the Solar Chromosphere.The Astrophysical Journal,902(1).
MLA Xu,Jing-Chen,et al."On the Rotation of the Solar Chromosphere".The Astrophysical Journal 902.1(2020).
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