The solar white-light flare of 1989 March 7 : simultaneous multiwavelength observations at high time resolution
The solar white-light flare of 1989 March 7 : simultaneous multiwavelength observations at high time resolution
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DOI：
10.1086/172442
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发表时间：
1993-03
期刊：
影响因子：
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通讯作者：
D. Neidig;A. Kiplinger;Howard S. Kohl;H. Philip;Wiborg
中科院分区：
文献类型：
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作者：
D. Neidig;A. Kiplinger;Howard S. Kohl;H. Philip;Wiborg
摘要：本文提供了1989年3月7日白光耀斑（WLF）的观测资料，包括SMM/HXRBS硬X射线测量和5000 A连续谱和3 A红、蓝翼H α线的CCD光学图象。光学数据以0.5s的速率在良好的视宁度下采集，并进一步处理以去除图像运动和失真。耀斑内核显示了一个脉冲上升的H α和连续，以及与脉冲硬X射线。热发射显示出红色的不对称性，我们解释为多普勒红移与色球层的爆炸加热。这些结果是一致的，与以前的观测描述，传统上已被解释在耀斑色球层的加热和电离的非热电子束。然而，以前没有报道过的新的观测结果包括：（1）耀斑核心分离成明亮的内核和较暗的外部区域，其中两个组件显示出明显不同的时间行为和热红不对称性，以及（2）相对于硬X射线的延迟约为1.5秒。在H α翼发射的脉冲上升中延迟1 s，随后在5000连续谱中延迟1-2 s。它的结论是，所观察到的通量和定时的硬X射线和WLF光发射与色球加热的非热电子是一致的，与额外的可见光连续可能是由强烈的色球复合连续（主要是巴耳末连续）照射的回温光球贡献。太阳：耀斑，太阳：X射线，伽马射线。
Abstract : We present observational data for the 1989 March 7 white-light flare (WLF), including SMM/HXRBS hard X-ray measurements and CCD optical images in 5000 A continuum and at 3 A in the red and blue wings of the H alpha line. The optical data were acquired at a 0.5 s rate under good seeing and were further processed to remove image motion and distortion. The flare kernel shows an impulsive rise in both H alpha and continuum that is well correlated with impulsive hard X-rays. The Hot emission shows a red asymmetry which we interpret as Doppler redshift associated with explosive heating of the chromosphere. These results are consistent with previous observational descriptions which traditionally have been interpreted in terms of heating and ionization of the flare chromosphere by a nonthermal electron beam. However, new observational results which have not been reported previously include (1) the separation of the flare kernel into a bright inner core and a fainter outer region, where the two components display distinctly different temporal behavior and amount of Hot red asymmetry, and (2) a delay, relative to hard X-rays, of approx. 1 s in the impulsive rise of the H alpha wing emission, followed by an additional 1-2 s delay in the 5000 continuum. It is concluded that the observed fluxes and timing of the hard X-ray and WLF optical emissions are consistent with chromospheric heating by nonthermal electrons, with additional visible light continuum possibly being contributed by a backwarmed photosphere irradiated by intense chromospheric recombination continua (principally Balmer continuum) .... Sun: flares, Sun: X-rays, Gamma rays.