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Evolutionary Characteristics of the Interplanetary Magnetic Field Intensity
Xiang NB(向南彬)1,2,3; Qu, Z. N.4
发表期刊ASTRONOMICAL JOURNAL
2018-10-01
卷号156期号:4页码:11
DOI10.3847/1538-3881/aadb91
产权排序第1完成单位
收录类别SCI
关键词Sun: Activity Sun: General Sun: Magnetic Fields
摘要

We use several mathematical methods, such as the continuous wavelet transform, the wavelet coherence (WTC), and the partial wavelet coherence, to investigate the distribution and oscillation periods of the daily interplanetary magnetic field (IMF) intensity as well as the connection between IMF fluctuations and solar activity indices (the magnetic plage strength index and the Mount Wilson sunspot index). The daily IMF intensity generally approximately follows a log-normal distribution that is directly related to the distribution of the active region flux. The short-term periods of the IMF are about 13.7, 27.6, 37.1, and 75.3 days. They are driven by the quasiperiodicity of the magnetic surges on the solar surface. The medium-term periods of 1.07 and 1.82 years need to be derived from the stochastic interaction of local fields and meridional flows, since coronal holes reflect the transport of the magnetic flux on the solar surface and variations in the meridional flow are seen in the heliosphere. The 10.9-year period is the Schwabe solar cycle and is to be mentioned first. The solar cycle variation of the IMF is not thought to be related to weak solar magnetic activity, but is dominated by the strong solar magnetic field activity seen on the disk, because the footpoints of the time-varying component of the interplanetary magnetic flux are rooted in regions that are located near the sources of coronal mass ejections that are related to active regions, while the constant component in the IMF is thought to initially and mainly come from the weak solar magnetic field activity. Finally, the slow variation of the IMF indicates that it may have a period of longer than 50 years.

资助项目NASA ; ONR ; NSF ; Mount Wilson Institute ; National Natural Science Foundation of China[11573065] ; National Natural Science Foundation of China[11503082] ; National Natural Science Foundation of China[11633008] ; National Natural Science Foundation of China[11603069] ; Foundation of the Sichuan University of Science and Engineering[2015RC43] ; Chinese Academy of Sciences
语种英语
学科领域天文学
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
ISSN0004-6256
URL查看原文
WOS记录号WOS:000444462300003
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]Coronal Mass Ejections ; Long-term Variations ; Solar Rotation ; Mount-wilson ; Geomagnetic-activity ; Temporal Variation ; Wavelet Transform ; Sunspot Numbers ; Voyager 1 ; Cycle
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/17917
专题抚仙湖太阳观测站
通讯作者Xiang NB(向南彬)
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People's Republic of China
2.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, People's Republic of China
3.Key Laboratory of Solar Activity, National Astronomical Observatories, CAS, Beijing 100012, People's Republic of China
4.Department of Physics, School of Science, Sichuan University of Science and Engineering, Zigong 643000, People's Republic of China
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GB/T 7714
Xiang NB,Qu, Z. N.. Evolutionary Characteristics of the Interplanetary Magnetic Field Intensity[J]. ASTRONOMICAL JOURNAL,2018,156(4):11.
APA Xiang NB,&Qu, Z. N..(2018).Evolutionary Characteristics of the Interplanetary Magnetic Field Intensity.ASTRONOMICAL JOURNAL,156(4),11.
MLA Xiang NB,et al."Evolutionary Characteristics of the Interplanetary Magnetic Field Intensity".ASTRONOMICAL JOURNAL 156.4(2018):11.
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