How can society protect itself from a major solar flare?
Short answerComplete shielding is impractical; harden critical systems, keep independent power and communications, and build enough redundancy to restore services after the event.
NotesA major solar flare can produce electromagnetic effects on a scale far beyond ordinary engineering assumptions. Past storms damaged telegraph networks and even affected undersea cables, showing how long conductors can carry disruption into connected systems. Shielding every power line and connection would be prohibitively expensive. Protecting critical equipment, giving hospitals independent power, and maintaining redundant communications offers a more realistic response. Ships and other isolated systems may survive better when backup equipment is available, although communications could still require extensive resets. The strategic lesson is resilience: preserve essential services and recovery capacity rather than promise complete protection from a rare system-wide shock.