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  • $\begingroup$ Not sure if this answer would be great but: how about "projected" northern lights? Like some very very big laser show a bit more pimped up? $\endgroup$
    – Fulli
    Commented Sep 26, 2014 at 7:33
  • $\begingroup$ Just more energetic solar storms. For example during the XIX century Carrington event Auroras as low as France. Definitively magnetic storms will help $\endgroup$
    – Barnaby
    Commented Jan 29, 2015 at 22:35