The Magnetic Storm is defined by the Dst index variation, but the acceleration of relativistic electrons during storm period has many variation mechanisms. Recently many satellites observed the magnetosphere around the Earth, like Wind, Cluster, FAST, Polar, Geotail, Akebono, IMAGE etc. The relativistic electron event(REE) affects the satellite because the interaction between particle and device. Then, various studies have progressed about the relativistic electrons. ULF and whistler wave activity rise the source of energization of particles at recent studies. Therefore we select some cases, and compare the wave activity and particle flux variations.,
