| Turbulence properties in the solar convection envelope： properties of the overshooting regions |
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| 作者单位： | Qian-Sheng Zhang(National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China;Graduate School of the Chinese Academy of Sciences, Beijing 100049, China);Yan Li(National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China)
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| 基金项目： | 国家自然科学基金，National Key Fundamental Research Project |
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| 摘 要： |
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| 关 键 词： | 对流模型 湍流特性 太阳能 过度 信封 湍流热通量 性能 太阳模型 |
Turbulence properties in the solar convection envelope: properties of the overshooting regions |
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| Authors: | Qian-Sheng Zhang Yan Li |
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| Institution: | [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 |
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| Abstract: | We apply the turbulent convection model (TCM) to investigate properties of tur-bulence in the solar convective envelope, especially in overshooting regions. The results show TCM gives negative turbulent heat flux uγ′T′in overshooting regions, which is sim-ilar to other nonlocal turbulent convection theories. The turbulent temperature fluctuation T′T′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 gradi-ent 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 raking 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 pa-rameters of TCM make the p-mode oscillation frequencies of the solar model be in betteragreement with observations. |
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| Keywords: | convection-turbulence-Sun helioseismology |
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