PHENOMENOLOGICAL STUDY OF INTERACTION BETWEEN SOLAR ACOUSTIC WAVES AND SUNSPOTS FROM MEASURED SCATTERED WAVEFUNCTIONS
文献类型：期刊论文
| 作者 | Yang, Ming-Hsu1; Chou, Dean-Yi1; Zhao, Hui2 ; Liang, Zhi-Chao1
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2012-08-10 |
| 卷号 | 755期号:1 |
| 关键词 | Sun: activity Sun: helioseismology Sun: interior Sun: oscillations sunspots Sun: surface magnetism |
| 英文摘要 | The solar acoustic waves around a sunspot are modified because of the interaction with the sunspot. The interaction can be viewed as that the sunspot, excited by the incident wave, generates the scattered wave, and the scattered wave is added to the incident wave to form the total wave around the sunspot. We define an interaction parameter, which could be complex, describing the interaction between the acoustic waves and the sunspot. The scattered wavefunction on the surface can be expressed as a two-dimensional integral of the product of the Green's function, the wavefunction, and the two-dimensional interaction parameter over the sunspot area for the Born approximation of different orders. We assume a simple model for the two-dimensional interaction parameter distribution: its absolute value is axisymmetric with a Gaussian distribution and its phase is a constant. The measured scattered wavefunctions of various modes for NOAAs 11084 and 11092 are fitted to the theoretical scattered wavefunctions to determine the three model parameters, magnitude, Gaussian radius, and phase, for the Born approximation of different orders. The three model parameters converge to some values at high-order Born approximations. The result of the first-order Born approximation is significantly different from the convergent value in some cases. The rate of convergence depends on the sunspot size and wavelength. It converges more rapidly for the smaller sunspot and longer wavelength. The magnitude increases with mode frequency and degree for each radial order. The Gaussian radius is insensitive to frequency and degree. The spatial range of the interaction parameter is greater than that of the continuum intensity deficit, but smaller than that of the acoustic power deficit of the sunspot. The phase versus phase speed falls into a small range. This suggests that the phase could be a function phase speed. NOAAs 11084 and 11092 have a similar magnitude and phase, although the ratio of their sizes is 0.75. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000306909500010 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6292]  |
| 专题 | 国家天文台_太阳物理研究部 |
| 作者单位 | 1.Natl Tsing Hua Univ, Dept Phys, Hsinchu, Taiwan 2.Chinese Acad Sci, Natl Astron Observ, Beijing 200012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Ming-Hsu,Chou, Dean-Yi,Zhao, Hui,et al. PHENOMENOLOGICAL STUDY OF INTERACTION BETWEEN SOLAR ACOUSTIC WAVES AND SUNSPOTS FROM MEASURED SCATTERED WAVEFUNCTIONS[J]. ASTROPHYSICAL JOURNAL,2012,755(1). |
| APA | Yang, Ming-Hsu,Chou, Dean-Yi,Zhao, Hui,&Liang, Zhi-Chao.(2012).PHENOMENOLOGICAL STUDY OF INTERACTION BETWEEN SOLAR ACOUSTIC WAVES AND SUNSPOTS FROM MEASURED SCATTERED WAVEFUNCTIONS.ASTROPHYSICAL JOURNAL,755(1). |
| MLA | Yang, Ming-Hsu,et al."PHENOMENOLOGICAL STUDY OF INTERACTION BETWEEN SOLAR ACOUSTIC WAVES AND SUNSPOTS FROM MEASURED SCATTERED WAVEFUNCTIONS".ASTROPHYSICAL JOURNAL 755.1(2012). |
入库方式： OAI收割
来源：国家天文台
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