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A study on red asymmetry of Hα flare ribbons using a narrowband filtergram in the 2001 April 10 solar flare

机译:2001年4月10日太阳耀斑用窄带滤镜对Hα耀斑带的红色不对称性进行研究

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We report on a detailed examination of the "red asymmetry" of the Hα emission line seen during the 2001 April 10 solar flare by using a narrowband filtergram. We investigated the temporal evolution and the spatial distribution of the red asymmetry by using Hα data taken with the 60-cm Domeless Solar Telescope at Hida Observatory, Kyoto University. We confirmed that the red asymmetry clearly appeared all over the flare ribbons, and the strong red asymmetry is located on the outer narrowedges of the flare ribbons, with a width of about 1.″5-3.″ 000 (1000-2000km), where strong energy releases occur. Moreover, we found that the red asymmetry, which also gives a measure of the Doppler shift of the Hα emission line, concentrates on a certain value, not depending on the intensity of the Hα kernels. This implies not only that the temporal evolutions of the red asymmetry and those of the intensity are not synchronous in each flare kernel, but also that the peak asymmetry (or velocity of the chromospheric condensation) of individual kernel is not a strong function of their peak intensity.
机译:我们报告通过使用窄带滤镜对2001年4月10日太阳耀斑期间Hα发射线的“红色不对称性”进行了详细检查。我们使用京都大学飞ida天文台的60厘米无圆顶太阳望远镜拍摄的Hα数据研究了红色不对称的时间演变和空间分布。我们确认,红色不对称现象在整个火炬带上均清晰可见,强红色不对称现象位于火炬带的外窄边上,宽度约为1.“ 5-3。” 000(1000-2000km),发生强烈能量释放的地方。此外,我们发现红色不对称度(也可以衡量Hα发射谱线的多普勒频移)集中在某个值上,而不依赖于Hα核的强度。这不仅意味着红色不对称性的时间演变和强度的时间演化在每个火炬核中并不同步,而且还暗示单个核的峰不对称性(或色球凝结速度)不是其峰的强函数。强度。

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