München 2019 – scientific programme

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EP: Fachverband Extraterrestrische Physik

EP 4: Sun and Heliosphere II

EP 4.3: Talk

Wednesday, March 20, 2019, 12:00–12:15, HS 19

Kinetic Solar Wind Models — •Sophie Aerdker — Ruhr-Universität Bochum

The processes of proton heating in the solar wind have not been determined yet but one possibility is the interaction with resonant ion-cyclotron waves. A kinetic model based on the Boltzmann-Vlasov equation is presented which takes the wave-particle interaction into account, so that the temporal evolution of the proton velocity distribution function can be calculated. The wave-particle interaction leads to diffusion in the velocity space, forming resonant shells whose shapes depend on the dispersion relation. Thus, the resulting velocity distribution function is expected to be deformed compared to the initial Maxwellian condition. The resonance condition as well as the dispersion relation of the ion-cyclotron waves are simplified in order to reduce the computational effort. The advantages and limitations of this new approach are tested and the results are compared to existing models.