Solar flares create shock waves in the corona and the chromosphere. They reach their maximum within minutes, and then die out. They are caused by the bending of magnetic field. When magnetic fields touch each other, they release an incredible amount of energy. This size is the X ray flux.
Solar flares produce an enormous amount of energy.
An X Class solar flare in 1989 damaged satellites, resulted in a massive power surge in parts of Canada, and worldwide radio signals were disrupted.