Definitions for "Coronal hole"
A hole in the Sun's atmosphere, which show up as a dark area. Holes are associated with open magnetic field lines. Researchers say high-speed solar winds originate in these holes.
A region in the Sun's corona where the solar magnetic field lines are open to interplanetary space (rather than closed back onto the visible solar surface) and that can connect via the solar wind with the Earth's magnetosphere. Typically associated with recurring minor magnetic storms and streams of faster than average solar wind. Back to the top.
A region in the Sun's outer atmosphere where visible coronal radiation is absent.
Keywords:  temperature, lower, area
an area of somewhat lower temperature