wrote:
Minimizing the effects of jamming for anything other than a military
grade, high power jammer is a fairly trivial problem but civilians
have no interest as it is in the real civilian world a non problem not
worth spending a single dime.
....
What makes you think that if there were a solar flare large enough to
"knock them all out at once" there would even be a functioning power
grid?

This appears to be a case of someone who is disliked saying that
1.1 + 1 ~= 2 and someone who should know better dragging what would be a
perfectly reasonable assertion through the mud. For the record, solar
flares can interfere with GPS signals, probably seriously:

http://www.news.cornell.edu/stories/...es.gps.TO.html
http://www.newscientist.com/article/...s-in-2011.html