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题名: Non-adiabatic oscillations of the low- and intermediate-degree modes of the Sun
作者: Xiong, D. R.1; Deng, L.2
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2010-07-11
卷号: 405, 期号:4, 页码:2759-2767
关键词: convection ; Sun: oscillations
学科分类: Astronomy & Astrophysics
DOI: 10.1111/j.1365-2966.2010.16662.x
文章类型: Article
英文摘要: Using a non-local time-dependent theory of convection, the linear stability is analysed for low- and intermediate-degree (l = 1-25) g4-p39 modes of the Sun. The results show that all the p modes with periods from similar to 3 to similar to 16 min are pulsationally unstable, while all the g, f and p modes with periods longer than similar to 16 min and the high-frequency p modes with periods shorter than similar to 3 min are stable except the low-degree (l = 1-5) p1 modes. The pulsation amplitude growth rates depend on only the frequency and almost do not depend on l. They achieve the maximum at nu similar to 3700 mu Hz (P similar to 270 s). The effects of radiation and convection on the stability are analysed in detail. The coupling between convection and oscillations plays a key role for stabilization of low-frequency f and p modes and excitation of intermediate- and high-frequency p modes. We propose that the solar 5-min oscillations are not excited by a single mechanism, but are resulted from the combined effects of the 'regular' coupling between convection and oscillations and the turbulent stochastic excitation. The coupling between convection and oscillations is the dominant excitation and damping mechanism for the low- and intermediate-frequency modes, and the turbulent stochastic excitation is the main excitation mechanism for high-frequency p modes.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: AMPLITUDE RED VARIABLES ; SOLAR P-MODES ; GRAVITATIONAL LENSING EXPERIMENT ; TIME-DEPENDENT CONVECTION ; EQUATION-OF-STATE ; PULSATIONAL STABILITY ; TURBULENT CONVECTION ; INTRINSIC VARIABLES ; STOCHASTIC EXCITATION ; STELLAR ENVELOPES
收录类别: SCI
语种: 英语
WOS记录号: WOS:000279450900050
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/11214
Appears in Collections:熊大闰_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China

Recommended Citation:
Xiong D. R.; Deng L.C.Non-adiabatic oscillations of the low- and intermediate-degree modes of the Sun ,MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2010,405(4):2759-2767
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