EGU General Assembly 2022
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Hybrid-Vlasov simulations of ion velocity distribution functions within Kelvin-Helmholtz vortices

Vertti Tarvus1, Lucile Turc1, Hongyang Zhou1, Giulia Cozzani1, Urs Ganse1, Yann Pfau-Kempf1, Markku Alho1, Markus Battarbee1, Maarja Bussov1, Maxime Dubart1, Harriet George1, Maxime Grandin1, Konstantinos Horaites1, Talgat Manglayev1, Konstantinos Papadakis1, Jonas Suni1, Ivan Zaitsev1, and Minna Palmroth1,2
Vertti Tarvus et al.
  • 1Department of Physics, University of Helsinki, Helsinki, Finland
  • 2Finnish Meteorological Institute, Helsinki, Finland

The Kelvin-Helmholtz instability (KHI) is a ubiquitous fluid instability in space plasmas. At the flanks of Earth's magnetopause, the KHI can typically develop during periods of northward interplanetary magnetic field, and it drives the solar wind-magnetosphere mass/energy transfer in the absence of dayside magnetic reconnection. We use local 2D-3V hybrid-Vlasov simulations to study the ion velocity distribution functions (VDFs) associated with the KHI in a magnetopause-like setup. Our results indicate that when the KHI enters the non-linear stage, the ion VDFs in the region perturbed by the instability become increasingly non-Maxwellian. The degree of non-Maxwellianity increases along with the magnitude of the density jump across the KHI boundary. We assess the impact of the non-Maxwellian ion VDFs on the development of the KHI, and compare the simulated VDFs with those observed by the Magnetospheric Multiscale Mission.

How to cite: Tarvus, V., Turc, L., Zhou, H., Cozzani, G., Ganse, U., Pfau-Kempf, Y., Alho, M., Battarbee, M., Bussov, M., Dubart, M., George, H., Grandin, M., Horaites, K., Manglayev, T., Papadakis, K., Suni, J., Zaitsev, I., and Palmroth, M.: Hybrid-Vlasov simulations of ion velocity distribution functions within Kelvin-Helmholtz vortices, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-7354,, 2022.


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