| Between the mid-sixteenth and seventeenth centuries, the sunspot cycle shut down, reducing solar output by a mere 0.25 percent. |
| Until now, Dr. Wolff said, there have been only indirect and inconclusive evidence for Rossby waves through sunspot observations. |
| Many magnetic storms occurred in tandem with reports of solar flares or of large sunspot regions near the Sun's equator. |
| He says sunspots are an indicator of the amount of energy radiating from the sun and we're currently coming out of a sunspot minimum. |
| They are more frequent every eleven years, a cycle that corresponds with maximum sunspot activity. |
| It is also believed that an increase in sunspot activity can have an affect on pole reversal. |
