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首页> 外文期刊>The Astrophysical journal >THE INVERSE-C SHAPE OF SOLAR CHROMOSPHERIC LINE BISECTORS
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THE INVERSE-C SHAPE OF SOLAR CHROMOSPHERIC LINE BISECTORS

机译：太阳染色体线平分线的逆C形状

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摘要

Spatially averaged intensity profiles of the chromospheric Na I D and Ca II infrared lines exhibit a pronounced red asymmetry in their cores with bisectors in the shape of an inverse C. This shape stands in stark contrast to the regular C shape of photospheric spectral line bisectors, which on average exhibit a blue shift as a result of the asymmetry in surface area subtended by convective upflows over downflows. The nature of the inverse chromospheric C shape is investigated by comparing spatially averaged profiles of the Na I D and Ca II infrared lines with mean profiles computed through three-dimensional snapshots of a hydrodynamic convection simulation and a one-dimensional simulation of chromospheric radiation hydrodynamics. In part the red asymmetry is the result of the asymmetry in time the atmosphere spends in downward motion compared to upward motion when it is traversed by acoustic shocks. Profiles from convection simulations without shocks suggest that convective motions play a limited role in shaping the chromospheric line asymmetry. Further simulations that include effects of both convection and shock wave formation are needed to reach a definitive conclusion on the origin of the inverse-C shaped bisectors.
机译：色球层Na ID和Ca II红外线的空间平均强度分布在其核心中具有明显的红色不对称性，其中等分线为倒C形。这种形状与光球光谱线等分线的常规C形形成鲜明对比。平均而言，由于对流上流与下流对流的表面积不对称，因此呈现蓝移。通过比较Na I D和Ca II红外线的空间平均轮廓线与通过水动力对流模拟的三维快照和色球层辐射水动力的一维模拟计算出的平均轮廓线，来研究反色谱层C形状的性质。红色不对称部分是由于大气受到声波冲击而向上运动时，大气向下运动的时间不对称的结果。对流模拟的结果表明，对流运动在限制色球层线不对称性方面的作用有限。需要进一步的模拟，包括对流和冲击波形成的影响，才能得出反C形等分线的原点的确切结论。

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