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Home Science & Environment Space Exploration

Gigantic 500,000-mile ‘hole’ in the sun’s atmosphere aims aurora-sparking solar wind at Earth (photo)

January 28, 2025
in Space Exploration
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circle with the northern lights inside and a pair of cartoon eyes looking to the top left.
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Aurora forecast

(Image credit: Daisy Dobrijevic/Canva)

Keep up with current northern lights forecasts and geomagnetic storm warnings with our aurora forecast live blog.

A colossal coronal hole, nearly 500,000 miles (800,000 kilometers) wide, has opened in the sun’s atmosphere, spewing fast-moving solar wind toward Earth.

Coronal holes are regions where the sun’s magnetic fields have opened up, allowing solar wind, to escape freely into space, according to spaceweather.com. These areas appear darker in ultraviolet images because the hot, glowing gases typically trapped within the magnetic fields are no longer contained, instead streaming outward into space.

The solar wind escaping from this coronal hole — the diameter of which measures over 62 times that of the diameter of Earth — is moving at speeds of more than 310 miles per second (500 kilometers per second). According to spaceweather.com, this flow is expected to reach Earth by Jan. 31, where it could spark minor (G1) geomagnetic storm conditions. While these storms are not severe, they can intensify auroral displays, creating vibrant northern and southern lights at higher latitudes. For an up-to-date breakdown of geomagnetic activity over the next 3 days, check out NOAA’s SWPC 3-day forecast. NOAA classifies geomagnetic storms using a G-scale, which ranks their intensity from G1 (minor) to G5 (extreme). The recent geomagnetic storm watch NOAA issued is rated as a G1.

Auroras occur when solar wind interacts with Earth’s magnetic field. The charged particles from the sun collide with gases in the upper atmosphere, such as oxygen and nitrogen, transferring energy to them. This energy is released as light, producing the colorful displays seen in the night sky. The stronger the solar wind, the more dynamic and widespread the auroras can become.

coronal hole on the surface of the sun on Jan. 28. close up view on the right shows a colossal dark region.

Coronal holes appear darker in ultraviolet images because the hot, glowing gases typically trapped within the magnetic fields are no longer contained. They are instead, readily spewing out into space. (Image credit: NASA/SDO)

Though G1 conditions are possible for Jan.31, remember that space weather is unpredictable and difficult to forecast, much like Earth’s weather. Even though geomagnetic storm warnings at this level are not uncommon, they can occasionally amount to nothing.

To stay updated on space weather and know the best times and places to catch auroras, consider using a space weather app tailored to your location. One app I recommend is “My Aurora Forecast & Alerts,” available on both iOS and Android. Another great tool is the “Space Weather Live” app on iOS and Android which offers more in-depth insights into current space weather conditions and their potential for aurora activity.

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