To predict line emission in the solar atmosphere requires models that are fundamentally different depending on whether the emission is from the chromosphere or the corona. At some point between the two regions, there must be a change between the two modelling regimes. Recent extensions to the coronal modelling for carbon and oxygen lines in the solar transition region have shown improvements in the emission of singly and doubly charged ions, along with Li-like ions. However, discrepancies still remain, particularly for singly charged ions and intercombination lines. The aim of this work is to explore additional atomic processes that could further alter the charge-state distribution and the level populations within ions, in order to resolve some of the discrepancies. To this end, excitation and ionization caused by both the radiation field and by atom–ion collisions have been included, along with recombination through charge transfer. The modelling is carried out using conditions which would be present in the quiet Sun. This allows an assessment of the part atomic processes play in changing coronal modelling, separately from dynamic and transient events taking place in the plasma. The effect the processes have on the fractional ion populations are presented, as well as the change in level populations brought about by the new excitation mechanisms. Contribution functions of selected lines from low-charge states are also shown, to demonstrate the extent to which line emission in the lower atmosphere could be affected by the new modelling.

中文翻译：

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光诱导过程和电荷转移对太阳低层大气中碳和氧的影响

要预测太阳大气中的线发射，需要根据发射是来自色球层还是来自日冕层的根本不同的模型。在两个区域之间的某个时间点，两个建模机制之间必须发生变化。最近对太阳过渡区域中碳和氧线的日冕建模的扩展表明，单电荷和双电荷离子以及类锂离子的发射有所改善。然而，差异仍然存在，特别是对于单电荷离子和相互结合线。这项工作的目的是探索额外的原子过程，这些过程可以进一步改变离子内的电荷态分布和能级群体，以解决一些差异。为此，包括由辐射场和原子-离子碰撞引起的激发和电离，以及通过电荷转移引起的复合。建模是使用安静的太阳中存在的条件进行的。这允许评估原子过程在改变日冕模型中所起的作用，与等离子体中发生的动态和瞬态事件分开。介绍了这些过程对分数离子种群的影响，以及新激发机制带来的能级种群变化。还显示了来自低电荷状态的选定线的贡献函数，以证明低层大气中的线发射可能受新模型影响的程度。建模是使用安静的太阳中存在的条件进行的。这允许评估原子过程在改变日冕模型中所起的作用，与等离子体中发生的动态和瞬态事件分开。介绍了这些过程对分数离子种群的影响，以及新激发机制带来的能级种群变化。还显示了来自低电荷状态的选定线的贡献函数，以证明低层大气中的线发射可能受新模型影响的程度。建模是使用安静的太阳中存在的条件进行的。这允许评估原子过程在改变日冕模型中所起的作用，与等离子体中发生的动态和瞬态事件分开。介绍了这些过程对分数离子种群的影响，以及新激发机制带来的能级种群变化。还显示了来自低电荷状态的选定线的贡献函数，以证明低层大气中的线发射可能受新模型影响的程度。与等离子体中发生的动态和瞬态事件分开。介绍了这些过程对分数离子种群的影响，以及新激发机制带来的能级种群变化。还显示了来自低电荷状态的选定线的贡献函数，以证明低层大气中的线发射可能受新模型影响的程度。与等离子体中发生的动态和瞬态事件分开。介绍了这些过程对分数离子种群的影响，以及新激发机制带来的能级种群变化。还显示了来自低电荷状态的选定线的贡献函数，以证明低层大气中的线发射可能受新模型影响的程度。