What is a geomagnetic storm?
A geomagnetic storm is a disturbance of Earth's magnetosphere caused by solar activity, such as coronal mass ejections.
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Science / Space Weather
G4 Geomagnetic Storm Triggers Aurora Sightings
A G4 (Severe) geomagnetic storm impacted Earth on January 20, 2026, leading to potential sightings of the aurora borealis, or Northern Lights, in regions as far south as North Carolina. This event, triggered by a coronal mass ejection (CME)...
Key Insights
- A G4 geomagnetic storm reached Earth, impacting the magnetosphere.
- The storm was caused by a coronal mass ejection (CME) from the sun.
- Particle charge (BZ) trending positive initially hindered aurora visibility in some areas.
- Aurora sightings were reported in some northern states and potentially as far south as North Carolina.
- Best viewing opportunities involve clear northern horizon views and using smartphone night mode features.
In-Depth Analysis
The geomagnetic storm resulted from a coronal mass ejection (CME), a significant release of plasma and magnetic field from the solar corona. When this CME interacts with Earth's magnetosphere, it can cause geomagnetic disturbances. The strength of these disturbances is measured on a scale, with G4 being classified as severe. The arrival of the CME was earlier and stronger than expected. Although initial conditions with positive particle charge (BZ) made aurora viewing challenging in some locations, the intensity of the storm raised the possibility of sightings in areas not typically known for aurora displays. For those hoping to capture the aurora, optimal conditions include a clear view of the northern horizon and the use of low-light or night mode settings on smartphones. Increasing exposure and using a tripod can further enhance image quality.
FAQ
What does G4 mean?
G4 is a rating on the NOAA Space Weather Scales, indicating a severe geomagnetic storm.
What is a coronal mass ejection (CME)?
A CME is a significant release of plasma and magnetic field from the Sun’s corona.
How can I photograph the Northern Lights with my smartphone?
Use low-light or night mode, increase exposure, stabilize your phone (tripod recommended), and use a timer to avoid shaking the camera.
Takeaways
- Stay informed about space weather alerts from NOAA.
- Be prepared for potential disruptions to communication and navigation systems during geomagnetic storms.
- If you are in an area where aurora sightings are possible, find a location with a clear northern horizon.
- Use smartphone night mode features and consider a tripod for capturing photos of the aurora.
- Share your aurora photos to contribute to citizen science and broader understanding.
Discussion
Did you see the Northern Lights during this geomagnetic storm? Share your experiences and photos! Share this article with others who need to stay ahead of this trend!
Sources
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