Carrington Event

The Carrington Event was the most intense geomagnetic storm in recorded history, caused by a massive solar flare and coronal mass ejection (CME) that struck Earth in 1859. It produced spectacular, widespread auroras and caused severe disruption to the telegraph systems, which were the cutting-edge technology of the time. A similar event today could have catastrophic effects on our modern, technology-dependent society.

The 1859 event

• A historical observation: On September 1, 1859, British astronomer Richard Carrington observed a powerful "white light flare" on the surface of the sun. A CME erupted from the sunspot and traveled towards Earth at an exceptionally high speed, reaching the planet in just 17.6 hours.
• Global auroras: When the charged solar particles collided with Earth's magnetosphere, they produced auroras so bright that people could read newspapers by their light at night. The phenomenon, normally confined to polar regions, was seen worldwide, with sightings reported as far south as Cuba, Jamaica, and Central America.
• Telegraphic havoc: The storm's electromagnetic currents surged through telegraph lines, the most advanced electrical technology of the day. Reports documented telegraph machines shocking operators, catching fire, and even transmitting messages while disconnected from their power sources.

Potential consequences today

A Carrington-level event today would be far more devastating due to our greater reliance on electronics and interconnected infrastructure.

• Widespread blackouts: Massive geomagnetic currents could overload and permanently damage high-voltage transformers in power grids, leading to widespread and prolonged electrical blackouts. Such an outage could disrupt essential services like water and wastewater systems, food and medication supply chains, and transportation.
• Satellite and GPS failure: Telecommunications and GPS satellites are highly vulnerable to intense solar activity. A major storm could knock out or damage electronics, corrupt memory, alter orbital paths, and increase atmospheric drag, potentially causing widespread satellite failure and creating dangerous space debris.
• Communication breakdown: A major storm could trigger widespread failures of the internet and telecommunications infrastructure, including both land-based and underwater cables. This would cause a total communication breakdown for telephone, radio, and television broadcasts.
• Economic impact: A 2008 National Academy of Sciences report estimated that the economic cost of a severe solar storm could be trillions of dollars in the United States alone.

Preparing for the next event

Scientists continuously monitor the sun and track solar activity to predict potential space weather threats, with some satellites specifically designed for early warnings. This allows industries to take precautions and improve the resilience of critical infrastructure. While extreme solar events are rare, they are an inevitable part of the sun's cycle, and a Carrington-level storm is a matter of "when," not "if".