For 10 points, name these cooler areas on the Sun's photosphere that appear dark.
These phenomena are counted using the Wolf number, and butterfly diagrams show the concentration of these regions in latitude bands. Coronal loops and mass ejections generally originate from these regions. Though they are not eclipses, they possess an umbra and penumbra. These electromagnetic phenomena go through a variation cycle of about (*) 11 years. For 10 points, name these cooler areas on the Sun's photosphere that appear dark.
These phenomena are counted using the Wolf number, and butterfly diagrams show the concentration of these regions in latitude bands.
{sunspots}