Ionospheric Parameter Inversion based on Stimulated Electromagnetic Emissions near Electron Gyroharmonic at EISCAT

Abstract:

High power and high frequency radio waves from the ground can generate plasma turbulence and associated electromagnetic emissions in the ionosphere. The characteristics of electromagnetic radiation observed on the ground are called Stimulated Electromagnetic Emissions (SEEs), that can be exploited for powerful diagnostics of the Earth’s ionospheric plasma. It has been pursued that quantitative comparison of ionospheric parameter inversion by SEEs and incoherent scatter radars (ISR) are required for understanding nonlinear physics in the resonance regime and developing new diagnostic tools. This work reports a holistic experimental investigation of Stimulated Brillouin Scattering (SBS) features, Downshifted Maximum (DM) features and ionospheric parameters near the third electron gyroharmonic using the European Incoherent scatter (EISCAT) heating facility. This work will investigate methods of ionospheric parameter inversion based on SBS and DM. Preliminary results show that electron temperature based on SBS agrees well with electron temperature and ion temperature by the ISR measurement. Also, we will discuss the possibility of retrieving multiple ionospheric plasma parameter based on multiple SEE emissions, including SBS and DM. This work sheds light on great potentials for develop realistic ionospheric diagnostic technique.