What Happened in 1859
On 1 September 1859, the English astronomer Richard Carrington observed a white flash on the Sun—an extremely strong solar flare. About 18 hours later, the associated coronal mass ejection (CME) reached Earth. The geomagnetic storm that followed was the strongest documented in history: telegraph systems failed or worked without batteries (induced currents powered them), aurora was seen as far south as the Caribbean, Rome, and Japan. Operators reported sparks, melting wires, and equipment that kept running with batteries disconnected.
Lessons for Today
A Carrington-level event today would stress power grids, satellites, and communications on a large scale. It is the reference worst case for space weather and motivates forecasting and mitigation (e.g. grid hardening, operator alerts). NOAA and other agencies monitor the Sun so that Earth-directed CMEs can be forecast and warnings issued. Cosmic Radar shows daily Kp and space weather events so you can follow current activity and understand the context of extreme events like the Carrington Event.
Sources and further reading
- NOAA – The Carrington Event – Historical overview and today's risks
- NASA – Historical space weather – Solar storms and impacts
- ESA Space Weather – Forecasting and preparedness