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题名: Multifractal properties of solar filaments and sunspots numbers
作者: Wu, Nan; Li, Qi-Xiu1; Zou, Peng
刊名: NEW ASTRONOMY
出版日期: 2015-07-01
卷号: 38, 页码:1-10
关键词: Sun: sunspots ; Sun: filaments ; Method: data analysis
学科分类: 天文和天体物理
DOI: 10.1016/j.newast.2014.12.008
文章类型: Article
英文摘要: We analyze multifractal properties of low (LLSFNs; < 50 degrees), high (HISFNs; >= 50 degrees), full-disk (FDSFNs; 0 degrees similar to 90 degrees) solar filament numbers (SFNs) and international sunspot numbers (ISNs) by estimating characteristic parameters (alpha(0), Delta(alpha), spectrum skewness) off (alpha) singularity spectrum. We find that the SFNs and ISNs have multifractal nature. The obtained alpha(0) and Delta(alpha) indicate that long-term behaviour of the solar filaments is more complex than that of the sunspots and the high-latitude filaments is the most complex in long-term behaviour. The spectrum skewnesses manifest that the ISNs display well symmetrical distribution in singularity strengths, whereas the SFNs are dominated by low singularity strengths, which means that the long-term behaviour of sunspots has homogenous structures and the filaments display averagely small fluctuations in amplitude. To detect the origin of their multifractality, we decompose the raw data of ISNs and SFNs: smoothed data represent similar to 11-year cyclic activities and detrended data represent accidental activities. We also calculate their f(alpha) spectra, respectively. We find that the similar to 11-year cyclic activities of filaments and sunspots tend to be a monofractal and display a bit predominance of low singularity strengths. Their accidental activities have the most complex behaviour than the raw and smoothed data. The accidental activities are dominated by high singularity strengths showing averagely large fluctuations in amplitude. Furthermore, multifractal properties from alpha(0) and Delta(alpha) of the accidental activities have the same features as that of raw data. We think that the similar to 11-year periodic activity determines global fluctuations, while the accidental activities rule local complexity. (C) 2014 Elsevier B.V. All rights reserved.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: CONTINUOUS WAVELET TRANSFORM ; STRANGE ATTRACTORS ; TIME-SERIES ; MAGNETIC-FIELD ; GENERALIZED DIMENSIONS ; ACTIVE REGIONS ; DIFFERENTIAL ROTATION ; FRACTAL DIMENSIONS ; CHAOTIC BEHAVIOR ; ACTIVITY CYCLE
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000351979500001
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14882
Appears in Collections:南极天文中心_期刊论文

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作者单位: 1.Chongqing Univ, Dept Phys, Chongqing 400044, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
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