Heating of postflare loops
Heating of postflare loops
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DOI：
10.1086/160786
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发表时间：
1983-03
期刊：
影响因子：
--
通讯作者：
P. Cargill;E. Priest
中科院分区：
文献类型：
--
作者：
P. Cargill;E. Priest
本文考虑了慢MHD激波对耀斑后环的加热。虽然这种环曾经被认为是一个双带耀斑的垂死残余，但现在人们认识到，它们是这种事件的主要部分，而且开始很早。研究表明，如果环的局部温度，它的局部倾斜角和周围的日冕条件从观测中已知，然后用简单的解析公式给出激波的上升速度和入射到激波上的蒸发流的大小。以1973年7月29日和1980年5月21日两次双带耀斑为例，计算结果与上升速度观测值符合较好，说明激波加热是一种可行的方法，可以长期加热耀斑后的环。
The heating of postflare loops by slow MHD shocks is considered. Although such loops were once thought to represent the dying remnant of a two-ribbon flare, it is now realized that they are the main part of such an event and begin very early on. It is shown that, if the local temperature of a loop, its local angle of inclination to the vertical, and ambient coronal conditions are known from observations, then simple analytical formulae give the rise speed of the shocks and the magnitude of the evaporative flow incident upon them. The formulae are applied as an example to the 1973 July 29 and 1980 May 21 two-ribbon flares, and reasonable agreement with rise-speed observations is found. It is therefore claimed that shock heating is a viable method for heating postflare loops for the long times observed.