In this work, we analyze the evolution of an EUV wave front associated with a solar eruption that occurred on 30 October 2014, with the aim of investigating, through differential emission measure (DEM) analysis, the physical properties of the plasma compressed and heated by the accompanying shock wave. The EUV wave was observed by the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO) and was accompanied by the detection of a metric Type II burst observed by ground-based radio spectrographs. The EUV signature of the shock wave was also detected in two of the AIA channels centered at 193 A and 211 A as an EUV intensity enhancement propagating ahead of the associated CME. The density compression ratio $X$ of the shock as inferred from the analysis of the EUV data is $X \approx 1.23$ , in agreement with independent estimates obtained from the analysis of the Type II band-splitting of the radio data and inferred by adopting the upstream–downstream interpretation. By applying the Rankine–Hugoniot jump conditions under the hypothesis of a perpendicular shock, we also estimate the temperature ratio as $T_{\mathrm{D}}/T_{\mathrm{U}} \approx 1.55$ and the post-shock temperature as $T_{\mathrm{D}}\approx 2.75$ MK. The modest compression ratio and temperature jump derived from the EUV analysis at the shock passage are typical of weak coronal shocks.

中文翻译：

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通过比较 EUV 和无线电数据估计 CME 驱动冲击的等离子体温度

在这项工作中，我们分析了与 2014 年 10 月 30 日发生的太阳爆发相关的 EUV 波前的演变，目的是通过差分发射测量 (DEM) 分析来研究被压缩和加热的等离子体的物理特性。伴随的冲击波。EUV 波由太阳动力学天文台 (SDO) 上的大气成像组件 (AIA) 观测到，并伴随着由地面无线电光谱仪观测到的公制 II 型爆发的检测。在以 193 A 和 211 A 为中心的两个 AIA 通道中也检测到了冲击波的 EUV 特征，作为在相关 CME 之前传播的 EUV 强度增强。根据对 EUV 数据的分析推断，冲击的密度压缩比 $X$ 为 $X \approx 1.23$ ，与从无线电数据的 II 类频带分裂分析中获得的独立估计一致，并通过采用上行-下行解释推断。通过在垂直冲击假设下应用 Rankine-Hugoniot 跳跃条件，我们还估计温度比为 $T_{\mathrm{D}}/T_{\mathrm{U}} \approx 1.55$ 和 post-shock温度为 $T_{\mathrm{D}}\approx 2.75$ MK。从激波通道处的 EUV 分析得出的适度压缩比和温度跳跃是弱日冕激波的典型特征。我们还估计温度比为 $T_{\mathrm{D}}/T_{\mathrm{U}} \approx 1.55$ 和震后温度为 $T_{\mathrm{D}}\approx 2.75$ MK . 从激波通道处的 EUV 分析得出的适度压缩比和温度跳跃是弱日冕激波的典型特征。我们还估计温度比为 $T_{\mathrm{D}}/T_{\mathrm{U}} \approx 1.55$ 和震后温度为 $T_{\mathrm{D}}\approx 2.75$ MK . 从激波通道处的 EUV 分析得出的适度压缩比和温度跳跃是弱日冕激波的典型特征。