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Butterfly-Shaped Coronal Hole
September 17 , 2025
16 hrs 0 min
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- NASA’s Solar Dynamics Observatory photographed a 5,00,000-kilometre-wide butterfly-shaped coronal hole on the Sun on September 11, 2025.
- Coronal holes are regions where the Sun’s magnetic fields open, allowing solar wind to escape into space.
- The solar wind from this coronal hole is projected to reach Earth around September 14, 2025.
- The event’s timing near the equinox increases geomagnetic risk due to the Russell–McPherron effect.
- These storms could potentially affect satellite operations and other technological systems on Earth.
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