As the mass ejecta reaches us, you can go outside and looking up with your eyes closed, you may be able to see the flashes of light in your retina as the particles decay and emit a photon. This will give you a perspective of how energetic these solar flares can be.
I used to use that method to check the shielding on xray diffraction equip at the rock labs . Many times techs would keep the shields off so they could quickly adjust the samples in the beam. The Ka1 radiation was a low emission but you could still get zapped and years later, I knew of several xray techs whove gotten various cancers.
Do they have any idea of the energy levels yet? will we lose any satellite service either by a forced shutdown or by zapping?