Solar flares and the solar wind affect the ionosphere and the magnetosphere of the earth.
Solar flares emit radiation throughout the entire radiation spectrum.
The impacts of a flare on earth depend on the location of the flare on the sun and the geometry with the earth. Introduction to the Space Environment . Solar-Terrestrial and Space Weather . Immediate Impacts For large flares, the solar X-Rays will cause short wave fadeouts for certain HF frequencies only in the sunlit hemisphere. The solar X-Rays direct affect the ionosphere of the sunlit hemisphere.