Fig. 32From: Earth-affecting solar transients: a review of progresses in solar cycle 24Magnetogram (scaled to ± 30 G) of a large coronal hole observed on 2013 May 29. The coronal hole boundaries are outlined in black. Regions with an absolute magnetic field density of more than 10 G are outlined in blue and of more than 50 G in red. Taken from Hofmeister et al. (2017)Back to article page