In this paper, the influence of the hydrogen (H+) band electromagnetic ion cyclotron (EMIC) waves on the hydrogen and helium velocity distributions has been studied. The hydrogen band EMIC waves have been investigated in the inner magnetosphere using the magnetospheric multiscale mission. The EMIC waves for the frequency range typical frequency have been frequently observed in the Earth's magnetosphere and have received considerable attention for energy transport across the magnetosphere. In this manuscript, we studied the velocity distribution of cold/hot proton and helium ions at different times of the event under consideration. For cold (1–600 eV) hydrogen ions, the velocity distribution is directly proportional to the growth rate of the EMIC wave, whereas the hot (1–40 keV) hydrogen ions have a ring distribution, which are not strongly influenced by the growth of EMIC waves like cold hydrogen ions, but the helium (1 eV–40 keV) ions are rarely influenced by EMIC waves.

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