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In 774 AD, the Sun blasted Earth with the biggest storm in 10,000 years
SyFy Wire ^
Posted on 1/8/2021, 12:45:48 PM by BenLurkin

Scientists found that the level of carbon-14, an isotope of carbon, was much higher in rings from that year than usual. Some years later, looking at air samples from ice cores, scientists saw that there were elevated levels of beryllium-10 and chlorine-36 as well.

The common factor in all these elements is that they are created when extremely high-energy subatomic particles hit Earth’s air and ground. .... The only way to get particles at energies like this is from space, where powerful magnetic fields in exploding stars...can accelerate the particles to such high speeds.

But the 774 event was so powerful that at first scientists were skeptical it could be from a flare. Once any other type of astronomical phenomenon was ruled out, though, a flare was all that was left

1989 the Sun erupted in a powerful series of flares as well as a huge coronal mass ejection (or CME) Carrying its own magnetic field, this bout of space weather slamme...
(Excerpt) Read more at syfy.com ...