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首页> 外文期刊>The Astrophysical journal >Hα AND HARD X-RAY OBSERVATIONS OF A TWO-RIBBON FLARE ASSOCIATED WITH A FILAMENT ERUPTION
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Hα AND HARD X-RAY OBSERVATIONS OF A TWO-RIBBON FLARE ASSOCIATED WITH A FILAMENT ERUPTION

机译：两根带发丝的耀斑的Hα和硬X射线观察

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摘要

We perform a multiwavelength study of a two-ribbon flare on 2002 September 29 and its associated filament eruption, observed simultaneously in the Ha line by a ground-based imaging spectrograph and in hard X-rays by RHESSI. The flare ribbons contain several Hα-bright kernels that show different evolutionary behaviors. In particular, we find two kernels that may be the footpoints of a loop. A single hard X-ray source appears to cover these two kernels and to move across the magnetic neutral line. We explain this as a result of the merging of two footpoint sources that show gradually asymmetric emission owing to an asymmetric magnetic topology of the newly reconnected loops. In one of the Hα kernels, we detect a continuum enhancement at the visible wavelength. By checking its spatial and temporal relationship with the hard X-ray emission, we ascribe it to electron-beam precipitation. In addition, we derive the line-of-sight velocity of the filament plasma based on the Doppler shift of the filament-caused absorption in the Hα blue wing. The filament shows rapid acceleration during the impulsive phase. These observational features are in principal consistent with the general scenario of the canonical two-ribbon flare model.
机译：我们在2002年9月29日对双色带耀斑及其相关的细丝喷发进行了多波长研究，这是通过地面成像光谱仪在Ha线和RHESSI的硬X射线中同时观察到的。耀斑带包含几个Hα明亮的内核，这些内核显示出不同的进化行为。特别是，我们找到了两个内核，它们可能是循环的脚步。单个硬X射线源似乎覆盖了这两个内核并在磁性中性线上移动。我们解释这是由于两个脚位源的合并，由于新重新连接的回路的磁拓扑不对称，这些源逐渐显示出不对称的发射。在一个Hα谷粒中，我们在可见波长处检测到连续谱增强。通过检查其与硬X射线发射的时空关系，我们将其归因于电子束沉淀。此外，我们基于Hα蓝翼中由细丝引起的吸收的多普勒频移推导了细丝等离子体的视线速度。在脉冲阶段，灯丝显示出快速加速。这些观测特征基本上与典型的两色带耀斑模型的一般情况一致。

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