Energetic particle precipitation (EPP) from the Earth’s magnetosphere is a key pathway for coupling between near-Earth space and the atmosphere. Wave–particle interactions, pitch-angle scattering, and other processes drive precipitation of electrons and ions across a wide energy range, yet significant uncertainties remain in quantifying these mechanisms, their variability, and their relative contributions, including possible missing loss processes.

Precipitating particles deposit energy in the upper atmosphere, producing odd nitrogen and hydrogen species (NOx and HOx) that influence atmospheric composition and can lead to ozone variability and dynamical responses.

This session invites contributions on both the mechanisms driving EPP and its atmospheric impacts. Topics include wave–particle interactions and scattering processes, radiation belt and ring current dynamics, quantification of precipitation fluxes and ionization rates, and their effects on atmospheric composition and dynamics. Observational, theoretical, and modeling studies, including satellite and ground-based measurements, are welcome.

• A - Atmospheric Sciences