MHD shock waves and discontinuities are often observed in the solar wind. We studied a strong shock wave event on 7 June 2014, during a solar maximum. The properties of forward shock are investigated and all physical parameters of interplanetary shock are analyzed. The upstream parameters, such as Alfven velocity and sound speed are calculated, and the angle ( $${\theta }$$ θ ) between the upstream magnetic field direction and the shock normal is estimated. To determine the propagation speed of the shock, a full numerical solution of shock adiabatic equation is carried out. The thermal pressure for electrons and ions are calculated and also the pressure ratio and the entropy change across the shock are estimated. The results show that the shock strength is about 3.88 with $${\theta }\approx \text{72 }^{\circ }$$ θ ≈ 72 ∘ (a quasi-perpendicular case), and shock propagation velocity is about 678 km/s. The increase in the specific entropy is also evaluated.

中文翻译：

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太阳活动极大期准垂直快前激波事件性质的计算研究

在太阳风中经常观察到 MHD 冲击波和不连续性。我们研究了 2014 年 6 月 7 日太阳活动极大期的强烈冲击波事件。研究了前向激波的性质，分析了行星际激波的所有物理参数。计算上游参数，如阿尔文速度和声速，并估计上游磁场方向与冲击法线之间的角度（$${\theta }$$ θ）。为了确定激波的传播速度，对激波绝热方程进行了全数值求解。计算电子和离子的热压，并估计冲击波的压力比和熵变化。结果表明，冲击强度约为3。88 与 $${\theta }\approx \text{72 }^{\circ }$$ θ ≈ 72 ∘（准垂直情况），冲击传播速度约为 678 km/s。还评估了比熵的增加。