naa a22 4500 510732003 CHVBK 20180411082956.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1134/S1063772913050053 doi (NATIONALLICENCE)springer-10.1134/S1063772913050053 Decay of activity complexes and the formation of coronal holes [Elektronische Daten] [A. Mordvinov, S. Yazev] Analysis of long-term measurements of solar magnetic fields and the flux of UV radiation from the Sun indicates a cause-effect relationship between activity complexs, their residual magnetic fields, and coronal holes. A comparison of the background magnetic fields of the Sun and the evolution of former activity complexes reveals unipolar magnetic regions that form after the decay of these complexes. The latitude and time evolution of unipolar magnetic regions in solar cycles 21-24 is studied. A North-South asymmetry in solar activity is manifest in the distribution of unipolar regions migrating toward higher latitudes. It is shown that, when residual magnetic fields of the opposite polarity reach the polar regions, this leads to a sign change of the polar magnetic field and a decrease in the area of polar coronal holes, or even their complete disappearance. These interactions can explain the triple sign change of the polar magnetic field of the Sun in cycle 21 and the short-term polarity reversals observed in 2010 and 2011. Pleiades Publishing, Ltd., 2013 Mordvinov A. Institute of Solar-Terrestrial Physics, Siberian Division of the Russian Academy of Sciences, Irkutsk, Russia aut Yazev S. Institute of Solar-Terrestrial Physics, Siberian Division of the Russian Academy of Sciences, Irkutsk, Russia aut Astronomy Reports SP MAIK Nauka/Interperiodica 57/6(2013-06-01), 448-457 1063-7729 57:6<448 2013 57 11444 https://doi.org/10.1134/S1063772913050053 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1063772913050053 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mordvinov A. Institute of Solar-Terrestrial Physics, Siberian Division of the Russian Academy of Sciences, Irkutsk, Russia aut NATIONALLICENCE 700 1- Yazev S. Institute of Solar-Terrestrial Physics, Siberian Division of the Russian Academy of Sciences, Irkutsk, Russia aut NATIONALLICENCE 773 0- Astronomy Reports SP MAIK Nauka/Interperiodica 57/6(2013-06-01), 448-457 1063-7729 57:6<448 2013 57 11444 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer