Connection of coronal holes with active regions

• Published in: Bulletin of the Crimean Astrophysical Observatory Vol. 108; no. 1; pp. 64 - 69
• Main Authors: Malashchuk, V. M., Fainshtein, V. G., Stepanyan, N. N., Rudenko, G. V.
• Format: Journal Article
• Language: English
• Published: Heidelberg Allerton Press, Inc 01.06.2012; Springer Nature B.V
• Subjects: Astronomy; Astrophysics and Cosmology; Black holes; Corona; Coronal holes; Magnetic fields; Parameter estimation; Physics; Physics and Astronomy; active regions; Sun; coronal holes
• ISSN: 0190-2717; 1934-7863
• DOI: 10.3103/S0190271712010172

We have determined two qualitative parameters for 643 coronal holes (CHs). Parameter A characterizes the magnetic-field variation in CHs depending on the height. Parameter B characterizes the connection between the magnetic field in a CH and the polar field at the photosphere level. A comparison of these parameters corresponding to CH with and without active regions (ARs) has led to the following conclusions: the formation of AR in CH is a frequent phenomenon, since the former exist in every other CH for at least 1 day; unlike the case of a CH without an AR, the configuration of the magnetic field above the CH with an AR often changes with the height: two out of three CHs have the opposite sign of the magnetic field in photosphere, as compared to the sign of the polar magnetic field; the areas of ARs in CHs do not differ from those for many other ARs outside of CHs.