The 2024 EPS Excellent Paper Award is granted to the paper by Yoshiharu Omura (2021).

Whistler waves of terrestrial origin, mostly lightning, are well-known. Using satellite observations also whistler chorus, characterized by rising and falling tones, have been reported at larger radial distances. Prof. Omura’s paper compiles the research findings and insights that he has accumulated over many years, demonstrating that nonlinear growth by wave-particle interactions is needed to explain the observed amplitudes and frequency variation of waves which are initially excited by non-thermal electron distributions in the radiation belts. Furthermore, it explains related phenomena—such as the formation of subpacket structures, plasmaspheric hiss waves, and the attenuation of waves at half the electron cyclotron frequency—through theoretical analysis and simulation results. The paper comprehensively discusses the nonlinear theory of electron plasma waves, serving as a valuable reference for researchers in the field. Moreover, its impact extends beyond electron plasma waves, as it has been cited in studies on ion plasma waves and plasma waves at the bow shock of Earth's and Mercury's magnetospheres. The work thus broadly contributes to the field of Space Physics. Therefore, the paper by Omura (2021) is well deserved for the 2024 EPS Excellent Paper Award.