From the ArcaMax Publishing, Trivia Newsletter:
http://www.arcamax.com/news/trivia/s-346624-538316
The northern and southern lights occur whenever sunspot activity is high, but the degree of sunspot activity is erratic. It is difficult to pinpoint exactly when they will occur. One can usually notice increased sunspot activity when radio and television reception is disrupted.
This news arrived on: 05/12/2008