Numerical Research on the Effect of the Initial Parameters of CME Flux-rope Model on Simulation Results. III. Different Initial Energy of CMEs
Numerical Research on the Effect of the Initial Parameters of CME Flux-rope Model on Simulation Results. III. Different Initial Energy of CMEs
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DOI：
10.3847/1538-4357/ac9b16
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
Yousheng Liu;F. Shen;Yi Yang;Mengxuan Ma
中科院分区：
文献类型：
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作者：
Yousheng Liu;F. Shen;Yi Yang;Mengxuan Ma
在数值研究中，日冕物质抛射（CME）的初始参数对模拟结果影响很大。我们之前的工作已经证明，当初始速度一定时，初始总质量主要决定CME的传播。在此基础上，我们从CME初始能量的角度进行进一步的研究。我们将分级圆柱壳模型引入到3D行星际总变差递减磁流体动力学模型中，以研究日冕物质抛射不同参数对模拟结果的影响。在本文中，我们模拟了几种具有不同初始参数的日冕物质抛射情况，并研究了不同初始能量成分的模拟结果。实际上，在行星际空间中，日冕物质抛射的动能始终占据主导地位。为了研究初始热能和磁能对CME传播过程的影响，在本次模拟中，我们调整初始参数，使热能和磁能达到与动能相同的水平甚至更高的水平。我们的结果表明，日冕物质抛射的初始总能量基本上决定了其到达地球的时间，这表明动能、热能和磁能对日冕物质抛射的传播具有相似的影响。而且，当总能量保持不变时，初始密度的减小会导致CME膨胀的增强，这可能使CME前端更早到达地球。
In numerical studies, the initial parameters of coronal mass ejections (CMEs) have great influence on the simulation results. In our previous work, it has been proved that when the initial velocity is constant, the initial total mass mainly determines the propagation of the CME. On this basis, we carry out further research from the perspective of CME initial energy. We introduced a graduated cylindrical shell model into a 3D interplanetary total variation diminishing magnetohydrodynamic model to study the effect of different parameters of CMEs on simulation results. In this paper, we simulate several CME cases with different initial parameters and study the simulation results with a different initial energy composition. Actually, in interplanetary space, the kinetic energy of the CME always plays a dominant role. In order to study the effect of the initial thermal energy and magnetic energy on the propagation process of the CME, in this simulation, we adjust the initial parameters to make the thermal energy and magnetic energy reach the same level as the kinetic energy or an even higher level. Our results show that the initial total energy of the CME basically determines its arrival time at Earth, which indicates that the kinetic energy, thermal energy, and magnetic energy have similar effects on the propagation of the CMEs. Moreover, when the total energy keeps constant, the decrease of initial density will lead to the enhancement of CME expansion, which may make the front of the CME reach Earth earlier.