Coronal Holes and Blue Holes

How I understand it is that a sunspot is on the surface of the sun and is a magnetic anomaly where it is cooler and can flare and a coronal hole is in the solar atmosphere known as the corona (crown) which is much hotter than the surface.

 

Millions Face Record Chill, Others Brace For Flooding – Severe Weather Risk Texas – Deep Blue Hole (14 min)