在遥远的足点加热作为沿太阳大气圈喷射流的制动器
Heating at the remote footpoints as a brake on jet flows along loops in the solar atmosphere
摘要：
我们报告了太阳动力学天文台（SDO），界面区成像光谱仪（IRIS）和1米新真空太阳望远镜（NVST）沿日冕环传播的太阳喷流的观测结果。喷流的喷出物由多热成分组成，并以大于100 km/s的速度传播。在Halalpha图像中，在具有紧凑和圆形形状的冠状环的远程足点处发现了增亮。大气成像组件（AIA）94 μ m通带中的远程增亮发射峰比喷流基座中的发射峰滞后60 s。在遥远的脚点的增亮被认为是由非热电子加热的后果，MHD波和/或由喷流的磁重联过程产生的传导前沿。在遥远的足点加热导致沿环向喷流底部的增亮延伸，这被认为是色球蒸发。这显然是作为一个制动器上的喷出物，导致减速的范围从1.5到3公里秒$^{-2}$的误差为$\sim1.0$ \，公里秒$^{-2}$时，色球蒸发和喷出物满足在附近的位置环顶点。这种喷流的动力学提供了一个独特的机会来诊断色球蒸发从遥远的足迹，从我们推断的速度在330- 880公里/秒的范围。
英文摘要：
We report on observations of a solar jet propagating along coronal loops taken by the Solar Dynamics Observatory (SDO), the Interface Region Imaging Spectragraph (IRIS) and 1-m New Vacuum Solar Telescope (NVST). The ejecta of the jet consist of multi-thermal components and propagate with a speed greater than 100 km/s. Brightenings are found in the remote footpoints of the coronal loops having compact and round-shape in the Halpha images. The emission peak of the remote brightening in the Atmospheric Imaging Assembly (AIA) 94 Åpassband lags 60 s behind that in the jet base. The brightenings in the remote footpoints are believed to be consequences of heating by nonthermal electrons, MHD waves and/or conduction front generated by the magnetic reconnection processes of the jet. The heating in the remote footpoints leads to extension of the brightening along the loops toward the jet base, which is believed to be the chromospheric evaporation. This apparently acts as a brake on the ejecta, leading to a deceleration in the range from 1.5 to 3 km s$^{-2}$ with an error of $\sim1.0$\,km s$^{-2}$ when the chromospheric evaporation and the ejecta meet at locations near the loop apexes. The dynamics of this jet allows a unique opportunity to diagnose the chromospheric evaporation from the remote footpoints, from which we deduce a velocity in the range of 330--880 km/s.
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