Suprathermal electron strahls. From small scale modeling to heliospheric implications

Recent advances in kinetic modeling reveal essential properties of the suprathermal populations opening perspectives for a realistic interpretation of their implications. Of particular importance are the suprathermal electron strahl (or beaming) populations, guided by the heliospheric magnetic field as kinetic-scale traces of the continuous solar outflows. We outline the main implications of the strahls by connecting their signatures in the velocity distributions with macroscopic properties of the solar wind, and processes conditioning their relaxation via coherent or non-coherent radiative emissions. The electron strahls may also help understanding major changes in the magnetic field topology in the outer corona, as shown by the most recent data from Solar Parker Probe, and during energetic (transient) events like coronal mass ejections, implying or not reconnection, but leading to strong interaction regions and shocks.