Assertion: sunspot's region | /r/HasProperty | grouped in pairs of opposite polarities
Facets:
Source sentences:
text: As noted previously (cf. slide #5), most regions of strong magnetic fields are grouped in pairs of opposite polarities; furthermore, at any given time the ordering of positive/negative regions with respect to the E - W direction (the direction of rotation, from left to right on these images) is the same in a given hemisphere, but is reversed from northern to southern hemispheres.