  North-south asymmetry of sunspot activity resulted in an asynchronous
reversal of the Sun's polar fields in the current cycle. The asymmetry is also
observed in the formation of polar coronal holes. A stable coronal hole was
first formed at the South Pole, despite the later polar-field reversal there.
The aim of this study is to understand processes making this situation
possible. Synoptic magnetic maps from the Global Oscillation Network Group and
corresponding coronal-hole maps from the Extreme ultraviolet Imaging Telescope
aboard the Solar and Heliospheric Observatory and the Atmospheric Imaging
Assembly aboard the Solar Dynamics Observatory are analyzed here to study a
causal relationship between the decay of activity complexes, evolution of
large-scale magnetic fields, and formation of coronal holes. Ensembles of
coronal holes associated with decaying active regions and activity complexes
are presented. These ensembles take part in global rearrangements of the Sun's
open magnetic flux. In particular, the south polar coronal hole was formed from
an ensemble of coronal holes that originated after the decay of multiple
activity complexes observed during 2014.
