The physical conditions in the chromosphere of polar and equatorial coronal holes in the decay phase of the 24-th solar activity cycle are studied. Models of the chromosphere are constructed based on the intensities of the HeI 10830 Å and Hα lines and using a non-LTE program. The calculations showed that the temperature in equatorial coronal holes is similar to that of polar coronal holes. The temperature in coronal holes is lower than that of the unperturbed chromosphere and increases depending on height in the chromosphere. The difference between the atmospheres of coronal holes and the quiet Sun begins at the level of the upper photosphere- lower chromosphere.

中文翻译：

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日冕洞的物理条件

研究了第 24 次太阳活动周期衰减阶段极地和赤道日冕洞色球层的物理条件。色球模型是基于 HeI 10830 Å 和 Hα 线的强度并使用非 LTE 程序构建的。计算表明，赤道日冕洞的温度与极日冕洞的温度相似。日冕洞中的温度低于未受干扰的色球层的温度，并随着色球层的高度而升高。日冕洞的大气层和安静的太阳大气层之间的差异始于上光球层 - 下色球层的水平。