... Magnetic Storms . ... Cosmic rays are not the only sign of high energy particles in the distant universe. Additional evidence comes (like most astronomical data) from visible light and other types of electromagnetic waves , e.g. x-rays and radio waves. Such waves usually arise in one of two ways--by " photon processes " and by processes resembling the broadcasting of radio waves . ... High-energy electrons in the magnetosphere also emit x-rays and radio waves, in their own style. ...