Small Magnetic Pockets Shape the Sun During Quiet Times

By Space.Fan Editorial DeskSeptember 30, 2026 at 11:02 PM UTC

Researchers found tiny magnetic flickers on the Sun that help explain how it sends light and energy to Earth even when it is not very active.

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The Drop

Even when the Sun looks calm, it is busy with invisible activity. Scientists used the space-based Helioseismic and Magnetic Imager to look at the Sun during a quiet period between 2019 and 2020. They discovered millions of tiny magnetic patches, each about the size of a small city on Earth. These little magnetic sources stay active for only a few minutes before disappearing. Sometimes, they even pulse, doubling their strength quickly before settling back down. By studying how these small spots change, researchers figured out that they help control the total amount of light and heat the Sun sends to us, which is known as solar irradiance. This shows that the Sun is never truly quiet, even when it is in a low-activity phase.

Why It Matters

This discovery helps us understand the Sun's long-term behavior. By watching how these tiny magnetic patches change the Sun's light output, scientists can better predict how the Sun affects Earth's environment over many years. It confirms that even the smallest magnetic features play a big role in how the Sun shines.

The Catch

While these observations provide a detailed look at the Sun, they only cover a specific time during a recent solar minimum. Because solar activity follows long, complex cycles, scientists are still working to understand exactly how these small-scale events fit into the bigger, century-long trends of the Sun's life cycle.

Put That in Perspective

Scientists tracked solar magnetic data going back to 1976. They noticed an overall drop in magnetic activity over the last few decades. Researchers suspect the Sun might start becoming more magnetically active again by 2029 as it moves into a new phase of its long-term cycle.

Source September 30, 2026

Sergey V. Marchenko, Judith L. Lean, Matthew T. DeLand, Ted Amdur

ADNET Systems, Inc., NASA Goddard Space Flight Center, University of Colorado, Aon Impact Forecasting·The Astrophysical Journal·10.3847/1538-4357/ae9ff3