yes, because the magnetosphere collapses every 6000 years, due to the combined magnetic fields of all the stars and large planets in our galaxy, in our orbit we go ~25000 years per orbit and the field is 360 degrees in that period, as it gets close to the next 90 degree shift it happens in a matter of decades, and we are coming up to one, that's why the auroras, the power outages, the polar ice melt (from UV where the shield is weaker at the poles)

idk about 300k years but for sure there is sufficient records that can be found hinting at the idea that humans have in living memory passed down through stories known about this cycle for at least 15000 years

modern humans have had their minds filled with such rubbish that almost nobody is going to be prepared for it, and much the same happened 12000 years ago, the 180 degree of the cycle is worse than the ones between and not only are we up for another one, it's almost certainly the worse ones... and the sun also blows up as well in this second cycle, what they are now recognising is a phenomena that all stars, due to the magnetic fields of the galaxy, triggers a "micro nova" and one was just spotted a few dozen light years away, in the area where we are currently headed.