When the eruption of an M3.2-Class solar flare occurred on January 19, launching a Coronal Mass Ejection (CME) in Earth's general direction, geomagnetic forecasters quickly began predicting the trajectory, intensity and size of the expanding cloud of plasma. It didn't take long for analysts at spaceweather.com and the Goddard Space Weather Lab to declare that Earth was in the direct path of the CME, and that a significant geomagnetic storm would be imminent on Saturday, January 21...likely around 22:30 UT (midday in Canada), give or take a few hours.
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