On September 2, 1859 telegraph operators all over North American noticed a peculiar thing: their machines, unplugged from a power source, kept working.
What was so special about that day and how could they operate their telegraphs without a connection to a power source? A solar flare of massive proportions had bombarded the earth with so much energy that the telegraph lines themselves were humming with energy. Telegraph operators all over the country reported their telegraph machines were operating better than ever off nothing more than the electrical feedback on the lines.
This event marked the first time effects of the sun had been observed on a communications network. Hit up the link below for the full story at Wired including the outlandish theories people had at the time as well as how communications networks were hardened overtime to help protect against interference.
Sept. 2, 1859: Telegraphs Run on Electric Air in Crazy Magnetic Storm [Wired]
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