In 1859, the Carrington Event, an unprecedented geomagnetic storm, generated strong electric currents in telegraph wires, disrupting their operation. Remarkably, some telegraph systems continued to function without external power, powered solely by geomagnetically induced currents. This phenomenon demonstrated the profound impact auroral electromagnetism can have on technology, even in the 19th century.
Source: https://gizmodo.com/how-the-carrington-event-let-telegraphs-run-on-aurora-p-1686759750?fbclid=IwY2xjawHSevZleHRuA2FlbQIxMAABHQPfps2fb9SH98t1VFPTpqucK0p97r0CZQTkc13_n2N-QE1ZIT3l5xwfQA_aem_4NYLl9CxW7BhL99WL7zWZg
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