I wonder if there's a Paleo-proxy or some kind of natural record that could be used to trace the frequency and magnitude of these events throughout Earth's geological past and if anyone is looking into it? For example we can look at the ocean sediments (usually by measuring changes in isotopic ratio of different compounds) and infer a great deal on temperature, carbon cycling, polar reversal, ocean circulation, chemistry etc. going back millions of years. It would be really neat and helpful if we discovered a proxy that we could use to trace solar flares hitting earth.
