Wave-particle interactions in the outer regions of the dayside magnetosphere

Different types of electromagnetic waves propagate and interact with charged particles in the outer regions of the dayside magnetosphere. We review previous measurements of Polar, Cluster, Themis, MMS and Van Allen Probes spacecraft missions to show examples of these interactions. Whistler mode chorus and exohiss emissions occur up to the magnetopause on the dayside with increasing Poynting flux. Chorus is generated by a nonlinear mechanism based on the cyclotron resonance with low energy electrons, and accelerates relativistic electrons in the outer radiation belt. Its fine structure of subpackets discovered by the Cluster mission strongly influences these processes. Equatorial noise emissions are generated from the ion Bernstein modes, have distinct polarization properties of their magnetic field components,  and propagate below the lower hybrid frequency. These waves, sometimes also denoted as the magnetosonic waves, can accelerate energetic electrons and occur up to the outer boundaries of the magnetosphere on the dayside. Relatively rarely occurring Electromagnetic ion cyclotron (EMIC) waves are generated by a nonlinear mechanism from instable ion distributions and also interact with energetic electrons. Measurements show that their occurrence rates increase in the outer regions close to the dayside magnetopause.