1921 CME may have been as bad as the Carrington Event of 1859

https://www.scientificamerican.com/article/new-studies-warn-of-cataclysmic-solar-superstorms/?fbclid=IwAR2RmjM3PKE56AvKmcViaxyBX83jXqSKQCIlgXogbvEDmpm0oOSTd7VbaME

The KP Index mentioned in the above link is reported in the 3rd chart under Space Weather Overview here:

https://www.swpc.noaa.gov/communities/space-weather-enthusiasts

This shows that damaging CME events are more likely than we thought.