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PHYSICAL PROPERTIES OF LARGE AND SMALL GRANULES IN SOLAR QUIET REGIONS
Yu, Daren1; Xie, Zongxia1,2; Hu, Qinghua1; Yang, Shuhong3; Zhang, Jun3; Wang, Jingxiu3
2011-12-10
Source PublicationASTROPHYSICAL JOURNAL
Volume743Issue:1
AbstractThe normal mode observations of seven quiet regions obtained by the Hinode spacecraft are analyzed to study the physical properties of granules. An artificial intelligence technique is introduced to automatically find the spatial distribution of granules in feature spaces. In this work, we investigate the dependence of granular continuum intensity, mean Doppler velocity, and magnetic fields on granular diameter. We recognized 71,538 granules by an automatic segmentation technique and then extracted five properties: diameter, continuum intensity, Doppler velocity, and longitudinal and transverse magnetic flux density to describe the granules. To automatically explore the intrinsic structures of the granules in the five-dimensional parameter space, the X-means clustering algorithm and one-rule classifier are introduced to define the rules for classifying the granules. It is found that diameter is a dominating parameter in classifying the granules and two families of granules are derived: small granules with diameters smaller than 1 ''.44, and large granules with diameters larger than 1 ''.44. Based on statistical analysis of the detected granules, the following results are derived: (1) the averages of diameter, continuum intensity, and Doppler velocity in the upward direction of large granules are larger than those of small granules; (2) the averages of absolute longitudinal, transverse, and unsigned flux density of large granules are smaller than those of small granules; (3) for small granules, the average of continuum intensity increases with their diameters, while the averages of Doppler velocity, transverse, absolute longitudinal, and unsigned magnetic flux density decrease with their diameters. However, the mean properties of large granules are stable; (4) the intensity distributions of all granules and small granules do not satisfy Gaussian distribution, while that of large granules almost agrees with normal distribution with a peak at 1.04 I(0).
KeywordSun: Granulation Sun: Photosphere Sun: Surface Magnetism Techniques: Image Processing
DOI10.1088/0004-637X/743/1/58
Indexed BySCI
Language英语
WOS IDWOS:000297408300058
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8029
Collection太阳物理研究部
Affiliation1.Harbin Inst Technol, Harbin 150001, Peoples R China
2.Harbin Inst Technol, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Yu, Daren,Xie, Zongxia,Hu, Qinghua,et al. PHYSICAL PROPERTIES OF LARGE AND SMALL GRANULES IN SOLAR QUIET REGIONS[J]. ASTROPHYSICAL JOURNAL,2011,743(1).
APA Yu, Daren,Xie, Zongxia,Hu, Qinghua,Yang, Shuhong,Zhang, Jun,&Wang, Jingxiu.(2011).PHYSICAL PROPERTIES OF LARGE AND SMALL GRANULES IN SOLAR QUIET REGIONS.ASTROPHYSICAL JOURNAL,743(1).
MLA Yu, Daren,et al."PHYSICAL PROPERTIES OF LARGE AND SMALL GRANULES IN SOLAR QUIET REGIONS".ASTROPHYSICAL JOURNAL 743.1(2011).
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