SMuK 2021 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 2: Sun and Heliosphere II
EP 2.7: Vortrag
Montag, 30. August 2021, 18:15–18:30, H7
Heating of Helium ions in a low-beta multi-ions plasma — •Zhaodong Shi1, Patricio Munoz1, Joerg Buechner1, and Siming Liu2 — 1Center for Astronomy and Astrophysics, Berlin Institute of Technology — 2Purple Mountain Observatory, Chinese Academy of Sciences
We study the heating of Helium ions (4He2+) in a multi-ions plasma consists of electrons, protons, and Helium ions via the 2D hybrid simulation using CHIEF code. Our results show that the eigenmodes of cold plasma waves in such a plasma can be recovered in our simulation. We find that Helium ions are heated both in the parallel and perpendicular directions (relative to the background magnetic field), while the perpendicular heating is preferred. Protons are also heated in the parallel direction, however, the perpendicular heating is very weak for them. And we find the significant parallel heating for both Helium ions and protons is due to the formation of ion beams and plateaus along the background magnetic field in their velocity distribution functions, while the perpendicular heating for Helium ions can be attributed to the increase of their perpendicular temperature. Our results are useful for understanding the preferential heating of 3He and other heavy ions in the 3He-rich solar energetic particle events, because Helium ions play a crucial role as the background ions regulating the behaviors of plasma in these events.