On Dec 5, 12:52 pm, "Jim Bennett"
wrote:

A friend of mine is planning a cruise around the Norway Russian border and
has asked when would be the best time to go in order to have the best chance
of seeing the Northern Lights. Bearing in mind that the cruise would have to
be booked some months in advance. Does anyone have any idea of a website
that would show this type of information. ?

http://www.polarimage.fi/

Some related physics he
http://www.iop.org/EJ/abstract/0029-5515/39/8/702/
http://nova.stanford.edu/%7Evlf/opti...veSprites.html

That last is an early paper on the subject of mega-lightning/above-
cloud lightning. Channel 5 had a programme on it a couple of years
ago.