Today’s UV Index: Lethal Deep inside the sun, magnetic lines of force are growing…building in ways not experienced for a millennium. When a pair of increasingly severe solar storms disables internet, communications, and GPS for millions around the globe, helioseismologist Greyson Finn fears the imminent arrival of a cataclysmic super flare, a magnetic explosion of the sun with the potential to obliterate life on earth. In a desperate bid to help the world prepare, Finn and his fellow scientists rush to address the critical question: will the solar weather subside, or is the worst yet to come? And if a super flare does arrive, what can they—or anyone—do to mitigate the disaster’s impact?