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arXiv 1004.4259astro-ph.SR
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Hinode/SOT和RHESSI观测到的2006年12月14日耀斑的G带和硬X射线辐射

G-band and Hard X-ray Emissions of the 2006 December 14 flare observed by Hinode/SOT and RHESSI

Kyoko Watanabe, Sam Krucker, Hugh Hudson, Toshifumi Shimizu, Satoshi Masuda, Kiyoshi Ichimoto

摘要:

我们报告的G-波段发射观测太阳光学望远镜船上的日之出卫星与2006年12月14日的X1.5级耀斑。G波段增强源自耀斑日冕磁回路的足点,与Reuven Ramaty高能太阳光谱成像仪观察到的非热硬X射线韧致辐射源相一致。在可用的2分钟节奏下,G带和硬X射线强度在时间上进一步良好地相关。假设G波段的增强是黑体的连续辐射,我们推导出白光耀斑的总辐射损失(白光功率)。如果G-波段增强另外有来自线的贡献,则导出的值被高估。在厚靶假设下,我们比较了白光功率和硬X射线产生电子的功率。与加速电子谱的截止能量无关,白光功率与加速电子的功率大致成正比。使用所观察到的截止能量的上限~30 keV,硬X射线产生电子提供比产生白光发射所需的功率多至少2倍的功率。对于高于40 keV的电子,功率大致匹配脉冲阶段期间可用的所有四个时间间隔。因此,耀斑加速的电子包含足够的能量来产生白光耀斑辐射。观测到的时间、空间和能量的相关性强烈地表明,太阳耀斑中的电子加速和白光产生是密切相关的。然而,结果也呼吁注意的不一致性,在视源高度的硬X射线(色球)和白光(上层光球)源。

英文摘要:

We report on G-band emission observed by the Solar Optical Telescope onboard the Hinode satellite in association with the X1.5-class flare on 2006 December 14. The G-band enhancements originate from the footpoints of flaring coronal magnetic loops, coinciding with non-thermal hard X-ray bremsstrahlung sources observed by the Reuven Ramaty High Energy Solar Spectroscopic Imager. At the available 2 minute cadence, the G-band and hard X-ray intensities are furthermore well correlated in time. Assuming that the G-band enhancements are continuum emission from a blackbody, we derived the total radiative losses of the white-light flare (white-light power). If the G-band enhancements additionally have a contribution from lines, the derived values are overestimates. We compare the white-light power with the power in hard X-ray producing electrons using the thick target assumption. Independent of the cutoff energy of the accelerated electron spectrum, the white-light power and the power of accelerated electrons are roughly proportional. Using the observed upper limit of ~30 keV for the cutoff energy, the hard X-ray producing electrons provide at least a factor of 2 more power than needed to produce the white-light emission. For electrons above 40 keV, the powers roughly match for all four of the time intervals available during the impulsive phase. Hence, the flare-accelerated electrons contain enough energy to produce the white-light flare emissions. The observed correlation in time, space, and power strongly suggests that electron acceleration and white-light production in solar flares are closely related. However, the results also call attention to the inconsistency in apparent source heights of the hard X-ray (chromosphere) and white-light (upper photosphere) sources.

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