Effects of Density Fluctuations on Alfvén Wave Turbulence in a Coronal Hole
Effects of Density Fluctuations on Alfvén Wave Turbulence in a Coronal Hole
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密度涨落对冕洞中阿尔文波湍流的影响
DOI：
10.3847/1538-4357/abe9b4
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
D. Savin
中科院分区：
文献类型：
--
作者：
M. Asgari;A. Asgari;Michael Hahn;D. Savin
我们提出了冕洞密度波动的研究。我们使用简化的磁流体动力学（RMHD）模型，该模型结合了观测约束的密度波动，以确定冕洞中的密度波动是否可以增强阿尔文波反射和耗散，从而加热冕洞并驱动快速太阳风。我们展示了两种背景大气模型的结果。每个模型都是动量方程的解，并包括波浪压力对太阳风流出的影响。在第一个模型中，等离子体密度和阿尔文速度随高度平滑变化。光滑模型中的波反射相对较弱，导致能量耗散率较低。在第二个模型中，我们根据观察结果包括沿通量管的额外密度波动。我们发现，密度 ρ 的波动约为 δρ/ρ ∼ 0.24，将阿尔文波湍流增加到足以加热冕洞中开放场区域的水平。
We present a study of density fluctuations in coronal holes. We used a reduced magnetohydrodynamic (RMHD) model that incorporated observationally constrained density fluctuations to determine whether density fluctuations in coronal holes can enhance Alfvén wave reflection and dissipation, thereby heating coronal holes and driving the fast solar wind. We show results for two models of the background atmosphere. Each model is a solution of the momentum equation and includes the effects of wave pressure on the solar wind outflow. In the first model, the plasma density and Alfvén speed vary smoothly with height. Wave reflection is relatively weak in the smooth model, resulting in a low energy dissipation rate. In the second model, we include additional density fluctuations along the flux tube based on the observations. We find that density ρ fluctuations on the order of δρ/ρ ∼ 0.24 increase the Alfvén wave turbulence to levels sufficient to heat the open field regions in coronal holes.
影响因子：
6.5
作者：
D. Banerjee;D. Pérez-Suárez;J. G. Doyle
通讯作者：
D. Banerjee;D. Pérez-Suárez;J. G. Doyle