1. S. I. Akasofu, The Northern Lights: Secrets of the Aurora Borealis, Alaska Northwest Books, Reprint Edition (2009).
2. N. Davis, Aurora watcher’s handbook, University of Alaska Press (1992).
3. What We See in the Aurora
4. Space Weather Prediction Center, www.swpc.noaa.gov, with current data and tutorials (2009).
5. Monitoring the aurora electronically;Knight,1982