Tiny Storms Keep a Young Star Glowing in Radio Light

By Space.Fan Editorial DeskSeptember 29, 2026 at 2:02 PM UTC

Scientists found that constant, miniature star flares are likely what power the steady radio glow of the active star AU Mic.

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The Drop

Astronomers used the Very Large Array, a powerful collection of radio telescopes, to peer at a young, active called AU Mic. Even though this is much younger than our sun, it is known for being quite rowdy. By watching the for three hours, the team spotted two small bursts of energy, called flares, and signs of others that were too faint to see clearly. This suggests the is constantly having little outbursts, even when it looks quiet from far away. The team used special radio bands to measure the 's light. They found that the 's steady, faint glow is likely caused by these tiny, hidden flares happening over and over across its surface. This process also traps high-energy particles in the 's magnetic field, keeping the glow going almost continuously.

Why It Matters

This discovery helps scientists understand how active s behave. It shows that s like AU Mic may not be perfectly steady; instead, they are covered in tiny, invisible 'microflares' that add up to create a constant hum of radio energy. By learning how these small events work, experts can better predict how magnetic fields on s influence their surroundings.

The Catch

While the data is strong, the flares are very small and difficult to detect. The researchers have to use models to interpret what is happening because they cannot see the surface of the in high detail. It is possible that other, unseen processes could also be contributing to the radio light, so more observations are needed to be sure.

Put That in Perspective

AU Mic is only about 22 million years old, making it an infant compared to our 4.6-billion-year-old sun. Comparing the two helps astronomers understand how our own sun might have acted when it was much younger and more energetic.

Source September 29, 2026

ApJ

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