Now that we've identified the problem, our next task in preparedness is to have various plans to take care of you and yours in the event that both power and communications go down. The good news (if you can call it that) is that a flare shouldn't catch us by total surprise. There would be time for a warning and a gap between actually getting hit and the loss of all communications. Earth's atmosphere and magnetic field would shield the surface from the direct energy of a solar flare, and terrestrial communication such as cell-phone networks (2G, 3G and 4G), TV and radio broadcasting and Wi-Fi are not as sensitive to solar energy and may keep running for a while. But the bad news is that if the power grid goes down for an extended period, the back-up systems for the wireless networks and cell-phone towers would, at some point, go down too.