Abstract
A model for the chromospheric-coronal transition layer and lower corona has been constructed for the south polar region. EUV observations acquired by the Harvard OSO-4 experiment in the fall of 1967 were used in the analysis. The observations can be explained with a simple model consisting of two types of regions. One region has a temperature-density structure similar to that in models developed for typical equatorial quiet areas. The other region has a corona in which the temperature and density are a factor of about 2 lower and the chromospheric-coronal temperature gradient is less steep by a factor of 4.
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Withbroe, G.L., Wang, YM. A model for the polar transition layer and corona for November 1967. Sol Phys 27, 394–401 (1972). https://doi.org/10.1007/BF00153110
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DOI: https://doi.org/10.1007/BF00153110