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arXiv 1702.07167astro-ph.SR
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关于IRIS“SJI 2832滤光片中耀斑辐射的起源:巴耳末连续谱还是谱线?

On the origin of the flare emission in IRIS' SJI 2832 filter: Balmer continuum or spectral lines?

Lucia Kleint, Petr Heinzel, Säm Krucker

摘要:

连续谱(“白光”,WL)的排放占主导地位的耀斑的能量。基于滤波器的观测,如IRIS SJI 2832滤波器,显示了耀斑期间类似WL的增亮,但尚不清楚这种发射是来自真实的连续发射还是增强的谱线,可能会变成发射。与光谱观测相反,基于滤波器的观测的困难在于确定哪些过程导致了耀斑期间观测到的增亮。在这里,我们确定的贡献的巴耳末连续谱和谱线发射IRIS的SJI 2832发射通过分析适当的通带同时IRIS NUV光谱。我们发现,谱线发射可以贡献高达100%的所观察到的SJI发射,相对的贡献通常随时间变化,并观察到的最高SJI增强是最有可能的,因为巴耳末连续。我们的结论是,在耀斑期间将SJI 2832称为连续滤光片时应小心,因为谱线对发射的影响可能很大。

英文摘要:

Continuum ("White-light", WL) emission dominates the energetics of flares. Filter-based observations, such as the IRIS SJI 2832 filter, show WL-like brightenings during flares, but it is unclear whether the emission arises from real continuum emission or enhanced spectral lines, possibly turning into emission. The difficulty in filter-based observations, contrary to spectral observations, is to determine which processes contribute to the observed brightening during flares. Here we determine the contribution of the Balmer continuum and the spectral line emission to IRIS' SJI 2832 emission by analyzing the appropriate passband in simultaneous IRIS NUV spectra. We find that spectral line emission can contribute up to 100% to the observed SJI emission, that the relative contributions usually temporally vary, and that the highest SJI enhancements that are observed are most likely because of the Balmer continuum. We conclude that care should be taken when calling SJI 2832 a continuum filter during flares, because the influence of the lines on the emission can be significant.

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