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.
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Translated from Astrofizika, Vol. 63, No. 3, pp. 479-488 (August 2020)
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Gopasyuk, O.S., Baranovskii, E.A., Tarashchuk, V.P. et al. Physical Conditions in Coronal Holes. Astrophysics 63, 421–429 (2020). https://doi.org/10.1007/s10511-020-09646-z
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DOI: https://doi.org/10.1007/s10511-020-09646-z