标题： 太阳耀斑中电子驱动蒸发的观测证据 显示英文标题

标题： Observational Evidences of Electron-driven Evaporation in two Solar Flares

摘要： 我们研究了2014年9月10日和10月22日发生的两个X1.6类太阳耀斑中硬X射线（HXR）辐射与由于色球蒸发引起的多普勒速度之间的关系。这两个事件都显示双带结构，界面区域成像光谱仪（IRIS）狭缝固定在其中一个带从耀斑开始时的区域。在这两个耀斑中检测到了爆炸性蒸发。冕线Fe XXI 1354.09 A显示出蓝移，而色球线C I 1354.29 A在脉冲阶段显示出红移。色球蒸发倾向于出现在耀斑带的前面。Fe XXI和C I都显示出其多普勒速度呈现“增加-峰值-减少”模式，这与HXR辐射的“上升-最大值-衰减”阶段密切相关。HXR辐射与Fe XXI多普勒位移之间的反相关性以及与C I多普勒位移的相关性表明，这两个耀斑中的蒸发是由电子驱动的。 显示英文摘要

摘要： We have explored the relationship between hard X-ray (HXR) emissions and Doppler velocities caused by the chromospheric evaporation in two X1.6 class solar flares on 2014 September 10 and October 22, respectively. Both events display double ribbons and Interface Region Imaging Spectrograph (IRIS) slit is fixed on one of their ribbons from the flare onset. The explosive evaporations are detected in these two flares. The coronal line of Fe XXI 1354.09 A shows blue shifts, but chromospheric line of C I 1354.29 A shows red shifts during the impulsive phase. The chromospheric evaporation tends to appear at the front of flare ribbon. Both Fe XXI and C I display their Doppler velocities with a `increase-peak-decrease' pattern which is well related to the `rising-maximum- decay' phase of HXR emissions. Such anti-correlation between HXR emissions and Fe XXI Doppler shifts, and correlation with C I Doppler shifts indicate the electron-driven evaporation in these two flares.