What would "tight" magnetic field lines look like?

[Christopher S.]

I'm observing the lower hemisphere, and see a finer and larger assortment of field lines than in the northern hemisphere. That contrast spawned a question, which is, what is the qualifier for calling those lines "tight"? As in, close?

Bonus question, is there always a mini flare when a magnetic field "disconnects" from two points on the surface? Pardon the ignorance, I'm tired and probably have overlooked a fundamental property of electromagnetism or several.

[3gMike]

I'm not sure that there is a precise definition, but I found this Wikipedia article  https://en.wikipedia.org/wiki/High_Resolution_Coronal_Imager that suggests strands of plasma 200km wide have been resolved, so that might suggest a fundamental limit on proximity. Looking at it from another perspective, the density of the lines will be linked to field strength, so maybe the PFSS model scales the number of lines to local field strength?