Turbulent structure of CME-driven sheath regions and their role as energizing charged particles in interplanetary space

• DOI: 10.5194/egusphere-egu24-8897
• Publication Date: 2024-03-08T18:18:58Z
• Authors: Emilia Kilpua; Simon Good; Rami Vainio; Matti Ala-Lahti; Nina Dresing; Jan Gieseler; Venla Koikkalainen; Adnane Osmane; Julia Ruohotie; Juska Soljento; Domenico Trotta; Christina Cohen; Timothy Horbury; Stuart Bale

Fast Coronal Mass Ejections (CMEs) gather compressed and heated solar wind ahead of them to for turbulent sheath regions. In this presentation we will first demonstrate with recent examples (using e.g. Parker Solar Probe and Solar Orbiter measurements) and the results from a statistical analysis (the ACE spacecraft data) that CME-driven sheath regions can significantly contribute to the acceleration of charged particles in interplanetary space, independent from the effect of the leading shock wave.  Then, we will present the key characteristics of sheath regions, e.g., variations of magnetic fied fluctuation and key turbulent properties across the sheath, that can have the key importance for the particle energization.