The cause of the northern lights is discussed here: http://www.nytimes.com/2008/07/25/science/space/25aurora.html?em&ex=1217131200&en=31562862f96f2176&ei=5087%0A 73, Larry, WB1DBY wb1dby at comcast.net Visit my local club: www.hcra.org Mobile Locater: http://www.findu.com/cgi-bin/find.cgi?call=WB1DBY-9