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arXiv 1401.4474astro-ph.SR
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太阳色球在1 Hz和0.“2决议

The solar chromosphere observed at 1 Hz and 0."2 resolution

Isabel Lipartito, Philip Judge, Kevin Reardon, Gianna Cauzzi

摘要:

我们最近报道了使用IBIS仪器在H α红翼观测到的色球精细结构的极其迅速的变化。在这里,我们检查在同一观测运行(2010年8月7日),一个成熟的活动区域NOAA 11094的数据。我们分析了更多的IBIS数据,包括波长扫描和来自太阳动力学天文台的数据,所有这些数据都是在30分钟的间隔内获得的。使用平板辐射转移模型,我们调查的物理性质的原纤维的管状与片状结构。主成分分析表明,非常快速的H α变化的线翼主要取决于线宽和线位移的变化,但Ca II 854.2的变化是由列密度的变化。管模型必须被拒绝为一个小的,但重要的一类纤维经历非常迅速的变化。如果我们的翅膀数据来自于导致“II型骨针”的相同结构,我们的分析对最近的工作提出了质疑。相反,这些数据并不拒绝这样的假设,即一些原纤维是收集到片材中的等离子体的光学叠加。我们回顾了帕克的切向不连续性理论如何自然地导致等离子体聚集到片层中,并表明片层图片是可证伪的。色球精细结构似乎由管和片构成。我们评估的优点,光谱成像与狭缝光谱为未来的研究。

英文摘要:

We recently reported extremely rapid changes in chromospheric fine structure observed using the IBIS instrument in the red wing of H alpha. Here, we examine data obtained during the same observing run (August 7 2010), of a mature active region NOAA 11094. We analyze more IBIS data including wavelength scans and data from the Solar Dynamics Observatory, all from within a 30 minute interval. Using a slab radiative transfer model, we investigate the physical nature of fibrils in terms of tube-like vs. sheet-like structures. Principal Component Analysis shows that the very rapid H alpha variations in the line wings depend mostly on changes of line width and line shift, but for Ca II 854.2 the variations are dominated by changes in column densities. The tube model must be rejected for a small but significant class of fibrils undergoing very rapid changes. If our wing data arise from the same structures leading to "type II spicules", our analysis calls into question much recent work. Instead the data do not reject the hypothesis that some fibrils are optical superpositions of plasma collected into sheets. We review how Parker's theory of tangential discontinuities naturally leads to plasma collecting into sheets, and show that the sheet picture is falsifiable. Chromospheric fine structures seem to be populated by both tubes and sheets. We assess the merits of spectral imaging versus slit spectroscopy for future studies.

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