Railway Records Correct Date of Early Solar Storm That Disrupted Telegraphs
Researchers used railway records, newspapers, solar observations, auroral reports, and geomagnetic data to re-examine a famous 19th-century space weather incident. They concluded that the Exeter railway disruption occurred in 1848, not 1841 as a Nature report had long suggested. The study also identifies a March 1847 telegraph disruption on Britain’s Midland Railway as an earlier credible case.
Solar outbursts such as flares and coronal mass ejections can shake Earth’s magnetic field. Moving magnetic changes can drive currents through lengthy wires, potentially harming grids, communications, satellites, and other systems. This context explains why nineteenth-century telegraph lines were vulnerable to space weather.
An anonymous 1870s Nature item dated an Exeter railway signal problem to October 18, 1841, delaying a 10:05 p.m. train by sixteen minutes. Yet the Exeter–Starcross route only opened in 1846. Using timetables, papers, solar and auroral records, and magnetic measurements, an international team placed the event on October 18, 1848, and found a March 1847 Midland Railway telegraph disruption.
This correction may sharpen how historians and space-weather scientists assess early technological vulnerability. It could influence public understanding of solar risk, emergency planning, and infrastructure design for grids, railways, and communications. Researchers, utilities, satellite operators, and historians may benefit from a more accurate timeline, while broader audiences could gain awareness that solar-driven disruptions are not new. The finding may also encourage using archival records alongside modern data to test assumptions about rare but high-impact events.