Thought this was interesting. It references another event I hadn't heard of:

The model confirmed that the detected solar event was approximately 18% stronger than the notorious AD 775 event—until now the strongest solar storm ever recorded in tree-ring archives.

https://en.wikipedia.org/wiki/774%E2%80%93775_carbon-14_spike

Over on HN, someone wrote this:

On the other hand, would allergy sufferers be marvelling at the removal of all the dust and pollen? This would be like the outdoors becoming a giant anti-static dust remover.

Not something I've heard about before, but that would be super interesting