Sunspot Numbers Sunspot Cycle

What is the aurora? - NASA

likely to occur during periods of high sunspot numbers, at the peak of the Sun’s eleven-year sunspot cycle. Then you might see an aurora once or twice a year in regions as far south as Texas or Florida. In the rarest events, auroras are observed near the equator, as when in 1909 the most potent geomagnetic storm on record

  Cycle, Number, Sunspots, Sunspot number, Sunspot cycles