[Getready]

Wouldnt all that excess c14 mess up the carbon 14 chronologies? How could c14 be a reliable universal chronometer if the amount in ambient atmosphere can vary from place to place based on solar activities and atmospheric distribution?

[null and void]

They calibrate out the natural year to year variations in ¹⁴C out by measuring known date samples, usually tree rings, which have an unbroken sequence dating back as far as ¹⁴C can be used.

[njslim]

Was another series of massive solar flares in 774 - 775 which were recorded by chroniclers

Associated with spike in Carbon 14 levels

https://en.wikipedia.org/wiki/774–775_carbon-14_spike