As mentioned in Part 1, it is thought that solar storms usually occur when the Sun is more active. However, a recent study based on the ice cores taken from Earth's polar ice sheets has shown that we still don't understand quite well the "temper" of the Sun.

When solar storms reached the Earth, radioactive isotopes, such as Beryllium-10 and Chlorine-36, were produced in the atmosphere and eventually deposited in the ice at places like Antarctica and Greenland. By analysing the chemical compositions of these ice cores, scientists found that a severe solar storm struck the Earth around 9,200 years ago when the Sun was in the quiet phase. If a solar storm of the same magnitude hits Earth today and we are caught unprepared, the consequence could be catastrophic.

People says women are unpredictable as weather, and so is the Sun!

For more about this research on the ice cores, please see:
https://www.nature.com/articles/s41467-021-27891-4