Abstract In addition to X-rays, extreme ultraviolet (EUV) rays radiated from solar flares can cause serious problems, such as communication failures and satellite drag. Therefore, methods for forecasting EUV dynamic spectra during flares are urgently required. Recently, however, owing to the lack of instruments, EUV dynamic spectra have rarely been observed. Hence, we develop a new method that converts the soft X-ray light curve observed during large flare events into an EUV dynamic spectrum by using the Solar Dynamics Observatory/Atmospheric Imaging Assembly images, a numerical simulation, and atomic database. The simulation provides the solution for a coronal loop that is heated by a strong flare, and the atomic database calculates its dynamic spectrum, including X-ray and EUV irradiances. The coefficients needed for the conversion can be calculated by comparing the observed soft X-ray light curve with that of the simulation. We apply our new method to three flares that occurred in the active region 12673 on September 06, 2017. The results show similarities to those of the Flare Irradiance Spectral Model, and reconstruct some of the EUV peaks observed by the EUV Variability Experiment onboard the Solar Dynamics Observatory.

中文翻译：

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太阳耀斑期间 EUV 动态光谱的临近预报

摘要 除了 X 射线外，太阳耀斑辐射的极紫外 (EUV) 射线也会导致严重的问题，例如通信故障和卫星拖拽。因此，迫切需要在耀斑期间预测 EUV 动态光谱的方法。然而，最近由于缺乏仪器，EUV 动态光谱很少被观察到。因此，我们开发了一种新方法，通过使用太阳动力学天文台/大气成像组件图像、数值模拟和原子数据库，将大型耀斑事件期间观察到的软 X 射线光曲线转换为 EUV 动态光谱。该模拟为被强烈耀斑加热的日冕环提供了解决方案，原子数据库计算了其动态光谱，包括 X 射线和 EUV 辐照度。可以通过比较观察到的软 X 射线光曲线与模拟的曲线来计算转换所需的系数。我们将我们的新方法应用于 2017 年 9 月 6 日发生在活动区 12673 的三个耀斑。结果显示出与耀斑辐照度光谱模型的相似之处，并重建了太阳上 EUV 变异性实验观测到的一些 EUV 峰值动力学天文台。