Dayside Low Energy Electron Precipitation Driven by Hiss Waves in the Presence of Ionospheric Photoelectrons

Abstract

AbstractAs was demonstrated by many observations, hiss waves are often to observed in the dayside plasmasphere and plumes. Previous studies of hiss waves have been focused on the scattering of energetic electrons of 10–1,000 keV energies and only recently this focus was shifted to the energies below several keV down to the energies of tens of eV. These studies, however, did not include electrons of ionospheric origin photo‐ and secondary‐ electrons. The major focus of our study is dayside low energy electron precipitation driven by hiss waves in the presence of ionospheric photo‐ and secondary‐ electrons. It is found that photoelectrons play an important role in hiss waves driven low energy electron precipitation phenomena. They are serving as the seed population that is required to study the low energy (below 1 keV) electrons using different kinetic approaches that are considered in this study. Our approach is based two kinetic codes: the SuperThermal Electron Transport (STET) and Fokker Plank (F‐P) models. The STET code couples magnetospheric hiss‐driven electron precipitation dynamic with ionosphere and forms the low energy MI coupling input to the F‐P code. The latter finalizes the formation of electron distribution function at magnetospheric altitudes via Landau resonant heating and forms the combined electron distribution function that is driven by Magnetosphere‐Ionosphere (MI) energy interplay processes.