
In 1859, a solar storm now called the Carrington Event induced currents so strong in telegraph lines that operators disconnected their batteries and kept sending messages powered by the aurora alone, with sparks jumping from the keys to their fingers
On September 2, 1859, the largest geomagnetic storm ever recorded induced currents so powerful in telegraph lines that operators across North America disconnected their batteries and kept working — powered entirely by the aurora — while sparks leapt from keys to their fingers.













