The Off-Key Bard
History

This Day in History — The Carrington Event Begins

On this day in 1859

On September 1, 1859, Carrington saw the first solar flare in history. Hours later, the most powerful geomagnetic storm ever recorded arrived. The wires talked back.

The Off-Key Bard looks toward the Sun, where an astronomer is about to witness a brilliant flash — and Earth is about to discover that storms on our star can reach across 93 million miles of space…

"The Sun looks peaceful from here. In 1859, it reminded humanity that it most certainly is not."

On the morning of September 1, 1859, British astronomer Richard Carrington was at his private observatory in Redhill, Surrey, projecting an image of the Sun onto a white screen to sketch a massive sunspot cluster that had been building for days. At 11:18 in the morning, two brilliant patches of intensely white light erupted across the sunspot group. He later wrote that the brightness was "fully equal to that of direct sunlight." He described it as "a singular outbreak of light which lasted about five minutes."

Carrington had just witnessed the first solar flare ever recorded by a human being. He had no idea what it was.

He was not alone. Richard Hodgson, observing independently from Highgate in north London, saw the same phenomenon at the same moment. Both men rushed to file reports. Their parallel accounts were published side by side in the Monthly Notices of the Royal Astronomical Society — the first documented evidence that the Sun could produce sudden violent eruptions of light. Carrington guessed immediately that the event might be connected to the magnetometer disturbances that had briefly spiked on the Kew Observatory instruments at exactly the same time. He was careful to note in his paper that he did not want to draw too firm a conclusion from a single observation: "One swallow does not make a summer," he wrote.

The summer, it turned out, was already on its way.

The Storm

This was the second great solar storm of that week. A precursor event on August 28 and 29 had already pushed auroras as far south as Havana and Panama — extraordinary enough on its own. The sunspot group had rotated to face Earth directly by September 1.

The coronal mass ejection that Carrington and Hodgson had unknowingly watched being launched crossed 93 million miles of space in just 17.6 hours — traveling at approximately 2,300 kilometers per second. A typical CME takes two to four days to make the same journey. The reason for the extraordinary speed: the August 28 event had cleared the surrounding solar wind plasma, leaving an open highway through interplanetary space for the September 1 ejection to travel unimpeded.

The storm peaked on the night of September 1 into September 2. What followed was something the modern world has never experienced and hopes never to again:

The Auroras: Electric green and crimson curtains of light blazed across the sky from the poles to the tropics. Auroras were reported from Cuba, Hawaii, Colombia, Japan, China, Venezuela, and across Europe and North America. The night sky over the Rocky Mountain west burned so brightly that gold miners in their camps woke up believing it was dawn and began cooking breakfast. In New England, people read newspapers by the aurora's light alone. Sailors navigating by magnetic compass found their instruments spinning uselessly.

The Wires: The global telegraph network — the most advanced communications infrastructure in the world in 1859 — absorbed the full force of the geomagnetically induced currents. Telegraph stations across North America and Europe reported identical phenomena: needles spinning, paper catching fire, operators receiving violent electric shocks. In Boston, a telegraph operator later described the sparks flying from his instrument. In Washington D.C., a telegraph printer burst into flames. In Pittsburgh, the magnetic disturbance was so severe that telegraph communication was impossible for hours.

And then came the detail that has haunted space weather scientists ever since. On the line between Boston and Portland, Maine, operators disconnected their batteries entirely. The induced current from the geomagnetic storm was more than sufficient to power the circuit on its own. For two hours, they sent and received messages using only the electricity coming out of the sky.

What It Means Today

The Carrington Event was not just a historical curiosity. It is the benchmark against which space weather scientists measure worst-case scenarios. The telegraph network of 1859, for all its vulnerability to induced currents, was simple enough to survive and recover. The technological infrastructure of the modern world is not.

A Carrington-scale event striking Earth today would find a civilization threaded from pole to pole with satellites, GPS systems, high-voltage power grids, fiber optic networks, and financial systems that depend on all of the above. A 2008 National Academy of Sciences report estimated that a repeat Carrington Event could cause $1 to $2 trillion in damage in the United States alone in the first year, with recovery taking four to ten years. Transformers in high-voltage transmission lines are particularly vulnerable: they are large, custom-built, and not manufactured domestically at scale. A widespread transformer failure could mean months without power for significant portions of the country.

The Sun has produced Carrington-scale events before, and will again. In July 2012, a CME of roughly comparable magnitude erupted from the Sun — and missed Earth by nine days. The planet it struck was where Earth had been one week earlier.

"A flash upon our nearest star,
Then currents raced from worlds afar…
The heavens burned from pole to pole,
As sunlight shook the wires below."

History reminds us: Earth does not exist in isolation. We live inside the extended atmosphere of an active star, and when the Sun storms, our technological world feels the pulse. Carrington tried to warn us, carefully, in 1859. The swallow he saw that morning was not alone.

Sources

← Back to the Desk — History