A Solar Coronal Hole and Fast Solar Wind Turbulence Model and First-orbit Parker Solar Probe (PSP) Observations
A Solar Coronal Hole and Fast Solar Wind Turbulence Model and First-orbit Parker Solar Probe (PSP) Observations
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DOI：
10.3847/1538-4357/abb132
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发表时间：
2020-09
期刊：
影响因子：
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通讯作者：
L. Adhikari;G. Zank;L.-L. Zhao-L.
中科院分区：
文献类型：
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作者：
L. Adhikari;G. Zank;L.-L. Zhao-L.
我们提出了一个连续性驱动的太阳风模型的快速太阳风流在一个开放的冕洞，太阳风流和磁场是高度一致的。我们比较了我们的模型的数值结果与帕克太阳探测器测量的快速太阳风流动，发现它们之间的协议。结果表明：（1）大部分准二维湍流是日冕加热的主要原因，在太阳半径范围内，太阳表面温度升高到K左右，从而导致太阳风的加速：（2）日冕底部附近准二维湍流的加热率大于近不可压/板状湍流的加热率;（3）前向传播模式的准二维能量随距离的增加而减小，而前向传播模式的近不可压缩/板能量随距离的增加而增加，在λ 11.7处达到峰值，然后随日心距离的增加而减小;（4）相关长度随距冕底距离的增加而增加;（5）密度涨落方差随日心距离的增加而减小。
We propose a turbulence-driven solar wind model for a fast solar wind flow in an open coronal hole where the solar wind flow and the magnetic field are highly aligned. We compare the numerical results of our model with Parker Solar Probe measurements of the fast solar wind flow and find good agreement between them. We find that (1) the majority quasi-2D turbulence is mainly responsible for coronal heating, raising the temperature to about K within a few solar radii, which leads in turn to the acceleration of the solar wind; (2) the heating rate due to quasi-2D turbulence near the coronal base is larger than that due to nearly incompressible/slab turbulence; (3) the quasi-2D energy in forward-propagating modes decreases with increasing distance, while the nearly incompressible/slab energy in forward-propagating modes increases, reaching a peak value at ∼11.7 before decreasing with increasing heliocentric distance; (4) the correlation length increases with increasing distance from the coronal base; and (5) the variance of the density fluctuations decreases as a function of heliocentric distance.