The Solar Wind with Hydrogen Ion Exchange and Large-scale Dynamics (SHIELD) Code: A Self-consistent Kinetic–Magnetohydrodynamic Model of the Outer Heliosphere
The Solar Wind with Hydrogen Ion Exchange and Large-scale Dynamics (SHIELD) Code: A Self-consistent Kinetic–Magnetohydrodynamic Model of the Outer Heliosphere
复制标题
具有氢离子交换和大尺度动力学（SHIELD）的太阳风代码：外日光层的自洽动力学-磁流体动力学模型
DOI：
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发表时间：
2022
影响因子：
4.9
通讯作者：
D. Borovikov
中科院分区：
文献类型：
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作者：
A. Michael;M. Opher;G. Tóth;V. Tenishev;D. Borovikov
中性氢已被证明会极大地影响日光层中的等离子体流和日光层边界的位置。我们提出了太阳风与氢离子交换和大尺度动力学（SHIELD）模型，一个新的，自洽的，动力学MHD模型的外层日光层内的空间天气建模框架的结果。电荷交换的平均自由程是日球层大小的量级，因此中性原子不能被描述为流体。数值代码SHIELD将单个等离子体流体的MHD解耦合到中性氢原子流过系统的动力学解。动力学代码是基于自适应网格粒子模拟器，蒙特卡罗方法求解玻尔兹曼方程。数值代码SHIELD准确地预测了星际中性粒子进入日光层的过滤增加。为了验证模型内的正确实施，我们比较了数值代码SHIELD的结果与其他建立良好的动态MHD模型。数值代码SHIELD与这些研究的中性氢解决方案相匹配，并且与中性氢原子的多流体处理相比，所有日光层边界更接近太阳。总的来说，数值代码SHIELD显示出与这些模型的良好一致性，是对星际氢流体处理的重大改进。
Neutral hydrogen has been shown to greatly impact the plasma flow in the heliosphere and the location of the heliospheric boundaries. We present the results of the Solar Wind with Hydrogen Ion Exchange and Large-scale Dynamics (SHIELD) model, a new, self-consistent, kinetic–MHD model of the outer heliosphere within the Space Weather Modeling Framework. The charge exchange mean free path is on the order of the size of the heliosphere; therefore, the neutral atoms cannot be described as a fluid. The numerical code SHIELD couples the MHD solution for a single plasma fluid to the kinetic solution for neutral hydrogen atoms streaming through the system. The kinetic code is based on the Adaptive Mesh Particle Simulator, a Monte Carlo method for solving the Boltzmann equation. The numerical code SHIELD accurately predicts the increased filtration of interstellar neutrals into the heliosphere. In order to verify the correct implementation within the model, we compare the results of the numerical code SHIELD to those of other, well-established kinetic–MHD models. The numerical code SHIELD matches the neutral hydrogen solution of these studies as well as the shift in all heliospheric boundaries closer to the Sun in comparison with the multi-fluid treatment of neutral hydrogen atoms. Overall the numerical code SHIELD shows excellent agreement with these models and is a significant improvement to the fluid treatment of interstellar hydrogen.