Turbulence properties in the solar convection envelope: properties of the overshooting regions

	Turbulence properties in the solar convection envelope: properties of the overshooting regions
	Zhang QS(张钱生)1,2 ; Li Y(李焱)1
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2009-05
卷号	9 期号:5 页码:585-595
关键词	convection turbulence Sun: helioseismology
ISSN号	1674-4527
通讯作者	Zhang, QS (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	We apply the turbulent convection model (TCM) to investigate properties of turbulence in the solar convective envelope, especially in overshooting regions. The results show TCM gives negative turbulent heat flux (ur(T')'T') over bar in overshooting regions, which is similar to other nonlocal turbulent convection theories. The turbulent temperature fluctuation (T'T') over bar shows peaks in overshooting regions. Most important, we find that the downward overshooting region below the base of the solar convection zone is a thin cellular layer filled with roll-shaped convective cells. The overshooting length for the temperature gradient is much shorter than that for element mixing because turbulent heat flux of downward and upward moving convective cells counteract each other in this cellular overshooting region. Comparing the models' sound speed with observations, we find that taking the convective overshooting into account helps to improve the sound speed profile of our nonlocal solar models. Comparing the p-mode oscillation frequencies with observations, we validated that increasing the diffusion parameters and decreasing the dissipation parameters of TCM make the p-mode oscillation frequencies of the solar model be in better agreement with observations.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	MODELS ; ZONE ; EQUATION ; STARS ; STATE
收录类别	SCI
原文出处	http://iopscience.iop.org/1674-4527/9/5/009/
语种	英语
WOS记录号	WOS:000266398200009
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5198]
专题	云南天文台_恒星物理研究组
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China 2.Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
推荐引用方式 GB/T 7714	Zhang QS,Li Y. Turbulence properties in the solar convection envelope: properties of the overshooting regions[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2009,9(5):585-595.
APA	Zhang QS,&Li Y.(2009).Turbulence properties in the solar convection envelope: properties of the overshooting regions.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,9(5),585-595.
MLA	Zhang QS,et al."Turbulence properties in the solar convection envelope: properties of the overshooting regions".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 9.5(2009):585-595.