These objects are often the endpoints of coronal loops, and they are caused when magnetic activity inhibits convective heat transfer.
Alexander Wilson observed that these objects behave as if they are slight depressions. George Hale noted that the magnetic polarities of these objects align east to west and periodically switch orientations. Horace Babcock created a model that explains why these objects tend to move towards lower latitudes, as observed by Richard Carrington. The Wolf number gives the number of these objects, which varies in an 11-year cycle described by Spörer's law. These objects are often the endpoints of coronal loops, and they are caused when magnetic activity inhibits convective heat transfer. For 10 points, name these dark areas of reduced temperature on the surface of the Sun.
Alexander Wilson observed that these objects behave as if they are slight depressions.
sunspots