Chalk it up to coincidence and leave it at that as far as I am concerned. What I would be more concerned with in and around March 18 is the G20 Summit that will be happening. Cryptos will surely be topic of discussion there, I feel like that will have more significant impact than a storm will.
Just wait for there to be negative decisions made at the G20 summit but the geomagnetic storm to get all the credit for the downfall of the market! Curse you solar wind shocks and your hatred of cryptocurrency!