Convenor: Craig Rodger (New Zealand)
Co-Convenors: Mark Clilverd (UK),  Bernd Funke (Spain), Hilde Ness Tyssoy (Norway)

This symposium is targeted at both, satellite and ground-based and experimental observations, as well as theoretical investigations, into the precipitation of energetic particles into the D-region ionosphere and below. Particle precipitation into the atmosphere is one of the mechanisms for energetic electron loss from the Van Allen radiation belts. This is particularly significant during and after geomagnetic storms, when the loss rate, and the source population, can both increase. Submissions describing other examples of energetic particle precipitation affecting the mesosphere and stratosphere, for example solar proton events or hard-spectrum substorm precipitation, are also relevant for this symposium. Papers considering the precipitation drivers, the nature of the particle fluxes, or the impact of the precipitation on the ionosphere or atmosphere are welcome. We particularly welcome observations of atmospheric chemical changes caused by energetic particles, new measurements from the Van Allen Radiation Belt Storm Probes or BARREL balloon campaigns showing energetic electron loss examples, or approaches showing how electron precipitation impacts can be applied by the atmospheric community. Results from the SCOSTEP SPeCIMEN and ROSMIC programmes, as well as from SPARC’s SOLARIS-HEPPA activity are solicited.

This symposium is co-sponsored by the International Commission on the Middle Atmosphere (ICMA) of IAMAS.