The University of Reading has 150 years of data to figure when solar activity is at is greatest. The next time, they warn, might start five years from now.
Solar cycles are about eleven Earth years in length - I'm unsure if that has to do with Earth's own effect on the Sun. We're in Cycle 25 which started December 2019. They say that as an odd-numbered cycle ends, the sun gets more violent.
This will affect when anyone can send up a stainless-steel rocket. The Apollo programme dodged a bullet by not flying in August 1972, they say. "We'll just launch it at night!!" won't exactly work when the radiation-belts are carrying particles over to the dark side.
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