G4 geomagnetic storm explained; what triggered the Sun’s fastest CME in 30 years https://english.mathrubhumi.com/technology/science/g4-geomagnetic-storm-explained-northern-lights-ub7kpme9?utm_source=dlvr.it&utm_medium=mastodon #CME #GeomagneticStorm #AuroraExplained #SpaceWeather #SolarFlare