Multiple eruptions from the Sun will create possible displays of Northern Lights in the U.S. this week, with ongoing impacts heading into the weekend.

NOAA’s Space Weather Prediction Center (SWPC) is tracking multiple coronal mass ejections (CMEs), explosions of plasma and magnetic fields, that happened earlier this week. When these charged particles arrive at Earth , it’s what causes a geomagnetic storm and corresponding Aurora Borealis, or Northern Lights.

While some CMEs can take several days to arrive at Earth, others can arrive in as fast as 15 hours, according to the SWPC. In this situation, with multiple CMEs, there is a domino effect, which could amplify impacts to Earth if they arrive one right after the other.

The SWPC is forecasting a moderate, Level 2 out of 5 , geomagnetic

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