The 1859 Carrington Event: How a Solar Storm Disrupted Telegraph Systems
In the small hours of 2 September 1859, a telegraph operator in Portland, Maine disconnected his batteries because they were throwing sparks, and then discovered he could still send a clean message to Boston using nothing but the current the aurora was pushing through the wire above his head.

Image: Maketecheasier
On September 2, 1859, telegraph operators along the American East Coast experienced a geomagnetic storm that allowed them to send messages using only the aurora-induced current. This unprecedented event, known as the Carrington Event, revealed the vulnerabilities of electrical systems to solar activity and has implications for modern infrastructure.
- 01The Carrington Event was the largest geomagnetic storm ever recorded, causing telegraph systems to malfunction and operate without batteries.
- 02Astronomer Richard Carrington was the first to observe a solar flare, which preceded the storm by a day.
- 03The storm's induced currents caused telegraph wires to spark and burn, disrupting communication across the East Coast.
- 04Modern electrical infrastructure is at risk from similar solar storms, with potential outages ranging from weeks to months.
- 05Forecasting solar storms provides limited warning, insufficient for replacing damaged transformers.
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On September 2, 1859, telegraph operators in Portland, Maine, and Boston reported unusual electrical phenomena due to a geomagnetic storm, later named the Carrington Event. This storm, which followed a solar flare observed by Richard Carrington, allowed operators to send messages using only the aurora-induced current, even after disconnecting their batteries. The storm generated strong induced voltages in telegraph lines, causing sparks and equipment damage. The event highlighted the vulnerabilities of the 19th-century telegraph system, which was effectively an antenna for geomagnetically induced currents. Modern electrical grids are similarly susceptible; a storm of this magnitude could lead to widespread blackouts, as demonstrated by past storms affecting power systems. While forecasting tools exist to provide warnings, they are inadequate for mitigating potential damage to critical infrastructure. The Carrington Event serves as a reminder of the sun's powerful influence on technology, a fact underscored by the recent discovery of Carrington's only known portrait, revealing the face of the man who first documented solar flares.
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The Carrington Event demonstrated the potential for geomagnetic storms to disrupt electrical communication and infrastructure.
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