This is the third geomagnetic storm to reach G4 status during the current 11-year solar cycle, which began in 2019, officials said.
A severe geomagnetic storm is impacting Earth and could produce powerful northern lights displays across portions of the United States on Sunday and Monday, the National Oceanic and Atmospheric Administration said. The agency's Space Weather Prediction Center first issued a geomagnetic storm watch Saturday, warning that a coronal mass ejection — an explosion of plasma and magnetic material from the sun — was making its way toward Earth.
Geomagnetic storms are known for creating the dazzling visual displays auroras, also called the northern lights when they appear in the Northern Hemisphere. Auroras are formed by interactions between the sun's solar wind and the Earth's protective magnetic field. They become brighter and more active as geomagnetic activity increases — and become visible farther from the poles.
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