The Lower Chromosphere in a Coronal Hole |
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| Authors: | R B Teplitskaya I P Turova O A Ozhogina |
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| Institution: | (1) Institute of Solar-Terrestrial Physics, Russian Academy of Sciences, Siberian Branch, P.O. Box 291, Irkutsk, 664033, Russia |
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| Abstract: | We study the Ca ii K, H, and λ 849.8 nm line profiles in two regions of the quiet Sun, one being located in the extensive low-latitude coronal hole observed
on 3 through 5 August 2003, and the other being located outside the coronal hole. Comparison of the profiles was carried out
separately for cells and cell boundaries of the chromospheric network. Our principal result is that space- and time-averaged
profiles of the central self-reversal in the coronal hole sites differ from those outside of the hole: Intensities of the
K3 and H3 central depressions are increased in the cells but are unchanged in the network; the height of the K2 peaks is reduced in the cells and particularly in the network; the central self-reversal asymmetry is intensified in the
network. Distinctions appear at a high confidence level. Line wings as well as average characteristics of the infrared line
remain practically unchanged. We discuss probable causes for this behavior of the lower chromosphere lines. |
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