论文标题
BlueShifted Si IV 1402.77Å线曲线在移动的耀斑内核中观察到了Iris
Blueshifted Si IV 1402.77Å line profiles in a moving flare kernel observed by IRIS
论文作者
论文摘要
我们分析了2015年6月22日M6.5级耀斑观察到的滑动耀斑内核的光谱，界面区域成像光谱仪（IRIS）。在耀斑的冲动和峰阶段，在SDO/AIA的131Å通道中观察到沿着丝带显示明显滑动运动的环。虹膜光谱仪缝隙观察到了一部分丝带，其中包括与Si IV，C II和Mg II中耀斑环相对应的移动核，在高1 s的节奏下。正如通常在大耀斑中观察到的那样，在内核中观察到的光谱大部分被红移并表现出明显的红色翅膀。但是，在其中一根丝带中的一个小区域中，Si IV1402.77Å线被部分蓝光，并带有相应的多普勒速度| v_ {d} |超过50 km s $^{ - 1} $。 In the same region, the C II 1334.53Å, 1335.66Å and 1335.71Å lines were weakly blueshifted (|v_{D}| < 20 km s$^{-1}$) and showed pronounced blue wings, which were observed also in the Mg II k 2796.35Å as well as the Mg II triplet 2798.75Å and 2798.82Å lines.我们发现，我们发现发生蓝光的区域是在弱场区域移动时的加速核前部。具有高分辨率的虹膜观察结果使我们能够首次捕获内核的加速度。蓝光色球和TR线的独特观察为当前耀斑模型提供了新的约束。
We analyze spectra of a slipping flare kernel observed during the 2015 June 22 M6.5-class flare by the Interface Region Imaging Spectrograph (IRIS). During the impulsive and peak phases of the flare, loops exhibiting an apparent slipping motion along the ribbons were observed in the 131Å channel of SDO/AIA. The IRIS spectrograph slit observed a portion of the ribbons, including a moving kernel corresponding to a flare loop footpoint in Si IV, C II, and Mg II at a very-high 1 s cadence. The spectra observed in the kernel were mostly redshifted and exhibited pronounced red wings, as typically observed in large flares. However, in a small region in one of the ribbons, the Si IV 1402.77Å line was partially blueshifted, with the corresponding Doppler velocity |v_{D}| exceeding 50 km s$^{-1}$. In the same region, the C II 1334.53Å, 1335.66Å and 1335.71Å lines were weakly blueshifted (|v_{D}| < 20 km s$^{-1}$) and showed pronounced blue wings, which were observed also in the Mg II k 2796.35Å as well as the Mg II triplet 2798.75Å and 2798.82Å lines. Using high-cadence AIA observations we found that the region where the blueshifts occurred corresponds to the accelerating kernel front as it moved through a weak-field region. The IRIS observations with high resolution allowed us to capture the acceleration of the kernel under the slit for the first time. The unique observations of blueshifted chromospheric and TR lines provide new constrains for current models of flares.
