Key Takeaways
1. Coronal mass ejections (CMEs) are massive bursts of magnetized plasma from the Sun’s corona that can disrupt the solar wind and cause geomagnetic storms on Earth.
2. On January 19, a geomagnetic storm rapidly shifted between levels G1, G2, G3, and G4, indicating its high intensity.
3. The storm was caused by a CME from an X1.9 solar flare, which reached Earth in about a day, traveling approximately 91 million miles.
4. The event produced stunning auroras that extended beyond polar regions, with sightings reported as far as Germany and the southwestern United States.
5. The auroras displayed vibrant colors like red, green, and magenta, with many images shared widely on social media.
Coronal mass ejections (CMEs) are huge outbursts of magnetized plasma that explode from the outer layer of the Sun, known as the corona. When these ejections occur, they travel through space, disrupt the solar wind, and can lead to geomagnetic storms on our planet.
January 19’s Storm
On January 19, Earth experienced one of these geomagnetic storms. Such storms are typically categorized into levels G1, G2, G3, and G4. The geomagnetic storm on January 19 quickly shifted between all four categories, showcasing its intensity.
Cause and Speed
The storm was triggered by a CME that was propelled from the Sun during a potent X1.9 solar flare. This CME moved at a remarkable speed, covering the approximately 91 million miles to reach Earth’s magnetosphere in just about a day.
The Auroras
This remarkable event resulted in stunning lights visible in the sky, known as auroras. Unusually, this particular aurora spread beyond the polar regions, illuminating mid-latitude skies. People in various places, ranging from Germany to the southwestern United States, reported seeing it.
The prolonged duration of these auroras made the event even more spectacular. After the initial impact, the CME kept interacting with Earth’s magnetic field, which remained disturbed for several hours. This led to multiple bursts of auroral activity instead of just a short-lived display.
A Colorful Display
In some areas, the northern lights appeared in vibrant shades of red, green, and magenta. Many images capturing this breathtaking scene were shared widely on social media.
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