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What effects did the geomagnetic storm of September 2, 1859 have on telegraph systems?
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Space weather
Earth's full North Polar auroral oval, in an image taken in ultraviolet light by the U.S. Polar spacecraft over northern Canada, April 6, 1996. In the colour-coded image, which simultaneously shows dayside and nightside auroral activity, the most intense levels of activity are red, and the lowest levels are blue. Polar, launched in February 1996, was designed to further scientists' understanding of how plasma energy contained in the solar wind interacts with Earth's magnetosphere.
The geomagnetic storm of September 2, 1859, often referred to as the Carrington Event, is the largest geomagnetic storm ever recorded.
This intense space weather event significantly disrupted 19th-century telegraph infrastructure. The storm induced an enhanced electric current within the telegraph wires, which was powerful enough to ignite the recording tape at various telegraph stations, leading to fires.12
These disruptions were observed following a massive coronal mass ejection associated with a solar flare that had been documented by astronomer Richard Carrington the previous day. The event remains a foundational case study in understanding how solar activity can impact technological systems on Earth.12