On September 2, 1859, during what is now known as the Carrington Event, telegraph operators George Wood in Boston and Frederick Royce in Portland made an observation that challenges our assumptions about infrastructure vulnerability to solar storms. According to SpaceDaily, both operators unplugged their batteries entirely—yet messages continued flowing across the network, powered by the geomagnetic current induced by the storm itself. Elsewhere on the telegraph network, the induced currents were violent enough that sparks jumped from telegraph keys and paper caught fire.
This historical record matters because it demonstrates a mechanism of solar storm damage we often discuss in abstract terms: geomagnetically induced currents (GICs) flowing directly through conductive infrastructure. Modern power grids, transformers, and communication systems operate on similar principles to 1859 telegraph networks—conductive loops in a planetary magnetic field. The 1859 operators' ability to send messages without batteries suggests the induced currents were powerful enough to drive electrical signals through the circuit. The fires reported elsewhere suggest those same currents reached destructive levels in different parts of the network.
The implication is straightforward: solar storms don't just knock out power sources. They can induce currents powerful enough to use infrastructure as a transmission medium itself—which means even disconnected or redundant systems may face hazards. A modern solar event comparable to 1859 would encounter far more complex, interconnected infrastructure: continental power grids, fiber-optic lines, transformers with lower insulation standards than they were designed for, and systems engineered with assumptions about normal geomagnetic conditions.
What the historical record does not tell us is the magnitude of the induced currents that September day, the voltage levels Wood and Royce measured, or detailed accounts of failure modes elsewhere on the network. The 1859 event remains the best available data point for a worst-case scenario—and it shows that induced currents alone can both power transmission and cause localized fires. Neither outcome should be assumed impossible in modern infrastructure.
