The Sun is not finished with us yet.
On May 10, the Sun reminded humanity of its quiet authority over the systems we have built to connect ourselves — an M5.7 solar flare from sunspot AR4436 silenced radio communications across the Atlantic, grounding the invisible infrastructure of flight, navigation, and amateur contact. The disruption was brief, but the accompanying coronal mass ejection is still traveling toward us, expected to brush Earth around May 13 and paint the northern skies with aurora borealis. We find ourselves in 2026, near the peak of the Sun's 11-year cycle, a season when the star grows restless and the boundary between the cosmic and the everyday becomes briefly, beautifully visible.
- At 9:39 a.m. Eastern on May 10, an M5.7 solar flare erupted from AR4436 and within hours had ionized Earth's upper atmosphere, knocking out high-frequency radio across the Atlantic used by aircraft, ships, and amateur operators.
- The silence was temporary, but a coronal mass ejection — a vast cloud of plasma and magnetic field — is still en route, expected to reach Earth around May 13 with enough force to trigger a G1-level geomagnetic storm.
- NOAA and the UK Met Office are tracking the incoming cloud closely, forecasting genuine aurora borealis visibility for Scotland, northern England, and the northern United States — a rare gift to lower latitudes.
- Scientists remain on alert: sunspot regions AR4436 and AR4432 are still active, and forecasters have not ruled out stronger M-class or even X-class flares in the days ahead as AR4436 rotates into more direct alignment with Earth.
- We are at solar maximum — 2026 is a peak year in the Sun's 11-year cycle — meaning the risk of communications and power disruptions is elevated, and the window for unexpected auroras in unusual places remains open.
The Sun sent a jolt through Earth's upper atmosphere on May 10, and by the next morning, radio operators across the Atlantic were scrambling. An M5.7 solar flare had erupted from sunspot region AR4436 at 9:39 a.m. Eastern time — not the most violent eruption the Sun can produce, but forceful enough to ionize the upper atmosphere and scramble the high-frequency radio signals that aircraft, ships, and amateur operators depend on. For a time, the Atlantic fell quiet in ways it rarely does.
The disruption was temporary, but the real event was still in motion. The flare came with a coronal mass ejection — a vast plume of plasma and magnetic material — that continued its journey through space after the flare itself faded. Scientists at NOAA and the UK Met Office tracked its path and concluded that part of this expanding cloud would likely brush past Earth around May 13. Not a direct hit, but close enough to matter.
The result will be a G1-level geomagnetic storm, the mildest category — nothing like the dramatic G5 superstorm of May 2024, but still capable of painting the night sky. The Met Office predicted genuine aurora borealis visibility for Scotland, northern England, and the northern United States, where charged solar particles colliding with oxygen and nitrogen high in the atmosphere produce those characteristic waves of green, purple, and red light.
The timing is not coincidental. 2026 is a peak year in the Sun's 11-year activity cycle, making eruptions more frequent and lower-latitude auroras more possible — while also raising the risk of more serious disruptions to communications and power infrastructure.
The story is not finished. Sunspot regions AR4436 and AR4432 remain active, and forecasters have not ruled out additional M-class eruptions or even an X-class flare in the coming days. As AR4436 continues rotating into more direct alignment with Earth, any new eruption could carry considerably more force. For now, the Atlantic has recovered its radio chatter — but the Sun is not finished with us yet.
The Sun sent a jolt through Earth's upper atmosphere on May 10, and by the next morning, radio operators across the Atlantic were scrambling. An M5.7 solar flare—moderate-to-strong on the scale that measures such things—had erupted from a sunspot region called AR4436 at 9:39 a.m. Eastern time. It was not the most violent kind of eruption the Sun can produce, but it was forceful enough. The flare came with a coronal mass ejection, a vast plume of plasma and magnetic field material hurled outward from the Sun's corona. Within hours, that energy had ionized the upper layers of Earth's atmosphere, scrambling the high-frequency radio signals that aircraft, ships, and amateur radio operators depend on. For a time, the Atlantic fell quiet in ways it rarely does.
The disruption was temporary, but the real show was still coming. The coronal mass ejection continued its journey through space, and by Sunday afternoon—around 1:13 p.m.—it had rotated into a position where it was beginning to face Earth more directly. Scientists at NOAA and the UK Met Office began tracking its path with precision. The consensus among forecasters was that part of this expanding cloud of solar material would likely brush past Earth around May 13. It would not be a direct hit, but close enough to matter.
When that cloud arrives, it will trigger what meteorologists call a G1-level geomagnetic storm—the mildest category on the scale. That might sound reassuring, and in one sense it is: this is nothing like the catastrophic G5 superstorm that lit up the sky two years earlier, in May 2024, when auroras were visible across vast stretches of the continental United States. But even a minor geomagnetic storm can paint the night sky. The Met Office predicted that people in Scotland, northern England, and across the northern United States would have a genuine chance of seeing the Northern Lights this week. The aurora borealis happens when charged particles from the Sun collide with oxygen and nitrogen high in Earth's atmosphere, producing those characteristic waves of green, purple, and red light that have captivated humans for millennia.
There is a particular reason why this is happening now. 2026 is a peak year in the Sun's 11-year cycle of activity. The star is more volatile than usual, more prone to eruptions, more likely to send disturbances our way. That means aurora sightings in lower latitudes—places that do not normally see them—become possible. It also means the risk of more serious disruptions to communications and power systems increases.
But the story is not finished. Scientists are still watching sunspot regions AR4436 and AR4432, both of which remain active and capable of producing more flares. Forecasters have not ruled out additional M-class eruptions in the coming days, and they have not ruled out something far more serious: an X-class flare, the most powerful category of solar activity. As AR4436 continues to rotate into a more direct alignment with Earth, any new eruption from that region could pack considerably more punch. For now, the Atlantic has recovered its radio chatter, and people in the northern latitudes are watching the sky. But the Sun is not finished with us yet.
Notable Quotes
The Met Office noted that 2026 marks a peak year for solar activity, increasing the likelihood of visible auroras in lower-latitude regions.— UK Met Office
The Hearth Conversation Another angle on the story
Why does a solar flare in May 2026 matter to someone sitting in London or Boston?
Because for a few hours, the radio signals that keep planes and ships talking to the ground got scrambled. And because if you're in the right place this week, you might see lights in the sky you've never seen before.
The article mentions this is a "peak year" for solar activity. What does that mean practically?
The Sun goes through cycles. Right now we're at the top of one—the star is more restless, more likely to throw things at us. It's like a teenager versus a calm adult. Same person, different moods.
How does a G1 storm compare to what happened in 2024?
The 2024 storm was a G5—the worst possible. This one is G1, the gentlest. But gentle is relative. It's still enough to make auroras visible where they usually aren't. It's the difference between a whisper and a shout, not between silence and a roar.
What are scientists actually worried about right now?
The sunspot regions that caused this are still active and rotating toward Earth. If they erupt again in the next few days, the impact could be much worse. They're watching to see if the Sun escalates from M-class flares to X-class ones.
If an X-class flare happened, what would actually break?
Satellites, power grids, GPS, communications networks—the infrastructure we've built that depends on radio and magnetic stability. The 2024 storm caused real damage. An X-class flare now could do far more.
So people should be worried?
Aware, not worried. Watch the sky if you're in the north. Keep an eye on space weather forecasts. But this particular event is manageable. It's the next one we need to be ready for.