
“Severe” geomagnetic storm G4 hits the Earth, Northern Lights in Italy: not the most powerful since 2003
Auroral phenomena spotted on the Asiago Plateau, in Veneto. Credit: LorsoBrezz, via The Earth was hit by one G4 category geomagnetic stormconsidered “severe” on a scale ranging from G1 to G5, and began around 8.38pm (Italian time) on Monday 19 January: it was caused by acoronal mass ejection (CME) produced by the Sun last January 18th, associated with a X1.9 ...








