Aliens Have Landed.

No not really they haven't landed but you could easily be forgiven for thinking so.
These are the greenhouses where all your tomatoes come from (I've told you this before) when at night they flood the houses with carbon dioxide or monoxide or something like that and this magenta light, don't ask I don't know why but you end up with bigger, juicer tomatoes.
When the cloud base is low this glow can be seen for miles, this shot is as it was taken no tweaks.