Active Region 4478 (AR 4478) is a giant sunspot group on the surface of the Sun that was discovered as it rotated forward on the eastern solar limb. This region has quickly gained attention as one of the largest sunspot groups in modern history, on par with the historic region AR 3664 from 2024. Characteristics and Size Enormous scale: The region spans an area significantly larger than planet Earth. It is so large that it can be seen with the naked eye if you wear approved solar eclipse glasses. Magnetic complexity: The sunspot group has been classified with the highest possible magnetic complexity (beta-gamma-delta). This means that its magnetic field lines are tightly entangled. Explosive potential: The complex magnetic structure means that AR 4478 carries enough energy to trigger powerful M-class and X-class solar flares.
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