How do solar flares interfere with communication and power systems?

Solar flares produce high energy particles and radiation that are dangerous to living organisms, mainly high-energy protons and electromagnetic radiation. these flares heat earth's outer atmosphere, causing it to expand, which increases the drag on earth-orbiting satellites, reducing their life-time in orbit. the particles and radiation emitted by these flares also disrupt radio waves, causing   communications to be disturbed. they can even affect the global positioning system to measure the position of the satellite.