 The energy of the electrons that contribute to the DIM emissions is from 0.1 to 100 MeV, while the leading contribution comes from the electrons with energy in the range 1–20 MeV.This radiation is well understood and was used since the beginning of the 1960s to study the structure of the planet's magnetic field and radiation belts.The particles in the radiation belts originate in the outer magnetosphere and are adiabatically accelerated, when they are transported to the inner magnetosphere.