John Dalton and Edward Maunder name periods where the activity of these entities was depressed.
In the current method for calculating their number, the number of their groups is multiplied by ten and added to the number of individuals; that method was developed by Rudolph Wolf. John Dalton and Edward Maunder name periods where the activity of these entities was depressed. Analysis of Beryllium-10 deposition has revealed a 200 year periodicity in their occurrence, and they are formed because stronger magnetic activity prevents convection. Their central region, called the umbra, contains a vertical magnetic field. For 10 points, identify these regions whose temperatures are around 4500 Kelvin, and are much cooler than the rest of the sun's surface.
In the current method for calculating their number, the number of their groups is multiplied by ten and added to the number of individuals; that method was developed by Rudolph Wolf.
{sunspots}