It means charged particles are penetrating the weakened magnetosphere in places that it rarely did before.

I need to add something to explain what I said earlier. In the movie They live, it is claimed the television is used to control the people, and the catatonic south park is prime example of social engineering mind rot and moral decay.
I think the only reason they ever allowed it on tv is because they didn;t think people would get it or would laugh at the horrible acting. BUT THE SETTING IS NOW, IN THE PRESENT DAY if you were paying attention. The drones, the economic failure, the violence of the police, all of these things were not going on in 88. The people who inspired carpenter to do the screen play this were visionaries, not sci fi writers.