Modeling the Solar Wind during Different Phases of the Last Solar Cycle
Modeling the Solar Wind during Different Phases of the Last Solar Cycle
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DOI：
10.3847/2041-8213/acc5ef
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发表时间：
2022-10
期刊：
影响因子：
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通讯作者：
Zhenguang Huang;G. Tóth;N. Sachdeva;Lulu Zhao;B. van der Holst;I. Sokolov;W. Manchester;T. Gombosi
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文献类型：
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作者：
Zhenguang Huang;G. Tóth;N. Sachdeva;Lulu Zhao;B. van der Holst;I. Sokolov;W. Manchester;T. Gombosi
我们描述了我们第一次尝试系统地模拟太阳风在不同阶段的最后一个太阳活动周期的阿尔文波太阳大气模型（AWSoM）在密歇根大学开发。这项研究的关键是确定模型最重要的输入参数之一坡印廷通量参数的最佳值，坡印廷通量参数规定了以阿尔文波湍流形式通过模型色球边界的能流。发现坡印廷通量参数的最佳值与开放磁场区域的面积相关，斯皮尔曼相关系数为0.96，而磁感应强度与磁场的平均无符号径向分量相关，斯皮尔曼相关系数为-0.91。此外，在上一个太阳活动周中，开放场区域的坡印廷通量近似恒定，这需要通过观测来验证，并可以揭示阿尔文波湍流如何在太阳活动周的不同阶段加速太阳风。我们的结果也可以用来设置坡印廷通量参数的实时太阳风模拟AWSoM。
We describe our first attempt to systematically simulate the solar wind during different phases of the last solar cycle with the Alfvén Wave Solar atmosphere Model (AWSoM) developed at the University of Michigan. Key to this study is the determination of the optimal values of one of the most important input parameters of the model, the Poynting flux parameter, which prescribes the energy flux passing through the chromospheric boundary of the model in the form of Alfvén wave turbulence. It is found that the optimal value of the Poynting flux parameter is correlated with the area of the open magnetic field regions with the Spearman’s correlation coefficient of 0.96 and anticorrelated with the average unsigned radial component of the magnetic field with the Spearman’s correlation coefficient of −0.91. Moreover, the Poynting flux in the open field regions is approximately constant in the last solar cycle, which needs to be validated with observations and can shed light on how Alfvén wave turbulence accelerates the solar wind during different phases of the solar cycle. Our results can also be used to set the Poynting flux parameter for real-time solar wind simulations with AWSoM.