Following a massive eruption of plasma from the sun—known as a coronal mass ejection (CME)—over the weekend, the National Oceanic and Atmospheric Administration’s (NOAA) Space Weather Prediction Center has issued geomagnetic storm watches for Monday and Tuesday, which could lead to colorful auroras.
Here’s where they may be visible—and how you could best see them.
When a CME reaches Earth, the charged particles can react with molecules in the planet’s magnetosphere—the region around the Earth where its magnetic field lies—to produce a geomagnetic storm. Such storms in turn can create auroras, vibrant displays of light that can appear in a variety of colors depending on the gases struck by the solar particles and how high up in the atmosphere the collision occurs.
The CME that exploded from the sun on Saturday is expected to reach Earth’s atmosphere on Monday. NOAA has forecast that it could produce a strong, G3-level storm on Monday and a moderate, G2-level storm on Tuesday.
When and where could they be visible on Monday?
During the day, any such light displays are blocked out by the sun and not visible. The geomagnetic storm resulting from the CME was forecast to be strongest on Monday between 11 a.m. and 2 p.m. ET, according to NOAA, with a G3 storm possible during that time.
That means auroras could be visible on Monday in the northern U.S. and Canada and—if the intensity of the storm does reach the stronger G3-level and stay there—could be visible further south still.
Notably, the forecast arrival times of CMEs can change by hours, which could lead to brighter-than-expected auroras in the sky Monday night. So for the most up-to-date information, keep track of the forecast as nightfall approaches in your area.
How can you see them best?
Cameras capture the lights better than the human eye, so viewing them through a lens may make the colors appear brighter. If you’re taking a photo, remember to use a long exposure for the best results.
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