Long-Lived Sunspots Produce 3-6x More Intense Solar Flares
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- NASA's Solar Active Region Spotter citizen science project tasked volunteers with answering questions about pairs of active region images captured by NASA's Solar Dynamics Observatory.
- Emily Mason (Predictive Science Inc.) and Kara Kniezewski (Air Force Institute of Technology), the project's leads, reviewed volunteer data and found that active regions whose strong magnetic fields persist for at least a month produce disproportionately more flares than shorter-lived regions.
- The Astrophysical Journal study reports that long-lived active regions are 3–6 times more likely than other active regions to be the source of the most intense kinds of solar flares.
- Researchers concluded the results make long-lived active regions a strong candidate for predicting space weather, since their slow decay gives forecasters a longer window to track and model them.
- Mason and Kniezewski noted the findings could also provide critical information on magnetic fields deeper inside the sun, tying surface behavior to interior dynamics.
Why it matters: Solar flares can disrupt satellites, communications, and power grids, and the study singles out long-lived active regions — a subset forecasters can actually watch for days or weeks — as the most flare-prolific, giving space weather modelers a more focused target. The 3–6× intensity multiplier is a concrete, actionable signal for prioritizing which sunspot groups warrant heightened monitoring.
