A notable #geomagnetic storm is expected to result from the arrival of a coronal mass ejection that erupted from the surface of the sun ☀️ on 📆 Saturday, Sept. 16 and was aimed in the direction of #Earth.
The level of #solar activity beginning in the 📆 1940s is exceptional – the last period of similar magnitude occurred around 9,000 years ago. The #Sun ☀️ was at a similarly high level of magnetic activity for only ~10% of the past 11,400 years. Almost all earlier high-activity periods were shorter than the present episode. #Fossil records suggest that the #SolarCycle has been stable for at least the last 700 million years. https://en.wikipedia.org/wiki/Solar_cycle#Cycle_history