What is a Geomagnetic Storm and why does it allow us to see the Northern Lights?

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ST. LOUIS- A Geomagnetic Storm Watch is in effect for part of the United States until December 11.

FOX2/KPLR meteorologist John Fuller explains a geomagnetic storm happens when the sun put out a solar flare, also known as a coronal ejection. He says the energy moves towards the earth and hits the earth’s magnetic field.

That shift in energy is what causes the colorful cosmic flares or auroras. Some also refer to these as the Northern Lights.

The cosmic flares may be able to be seen as far south as parts of Missouri and Illinois.

NOAA says the most intense disturbances will happen on Dec. 10th.

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