The Earth is surrounded by the radiation belts that consist of relativistic electrons. The growth and decay of the radiation belts come from the competition between generation and loss processes of energetic electrons. We conducted test particle simulations with a large number of relativistic electrons interacting with electromagnetic ion cyclotron (EMIC) triggered emissions. A substantial amount of relativistic electrons is trapped by the EMIC wave, and guided to lower pitch angles within a short time scale. We demonstrated that the relativistic electrons are efficiently precipitated into the atmosphere, resulting in a rapid loss of the radiation belt [1]. The coherent EMIC triggered emissions are well reproduced by energetic protons with large temperature anisotropy. The optimum wave amplitude and the transition from a linear stage to a nonlinear stage are in a good agreement with theory. A subpacket structure appears because of a new triggering wave [2]. The EMIC waves are found in the deep inner magnetosphere at L=2.5 - 5, based on observations by the Akebono satellite. The mode conversion and rising tone structures are clearly identified, which are consistent with theory [3].
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