These items can be classified using the Modified Zurich System in the letter range A to H, while their "activity" (as determined by Wolf) is proportional to 10 times the number of groups plus the number of members per group.
These items can be classified using the Modified Zurich System in the letter range A to H, while their "activity" (as determined by Wolf) is proportional to 10 times the number of groups plus the number of members per group. For ten points, name these concentrated areas of magnetic flux that result in a vortex of gas on the photosphere of the Sun.
These items can be classified using the Modified Zurich System in the letter range A to H, while their "activity" (as determined by Wolf) is proportional to 10 times the number of groups plus the number of members per group.
{Sunspot(s)}