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Parametrization of coefficients for sub-grid modeling of pitch-angle diffusion in global magnetospheric hybrid-Vlasov simulations

Sub-grid models are key tools to accurately describe the physical processes at play in a system when high-resolution simulations are not feasible. We previously developed a sub-grid model for pitch-angle diffusion in hybrid-Vlasov simulations of Earth's magnetosphere. However, a more precise de...

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Hauptverfasser: Dubart, Maxime (VerfasserIn) , Battarbee, M. (VerfasserIn) , Ganse, Urs (VerfasserIn) , Osmane, A. (VerfasserIn) , Spanier, Felix (VerfasserIn) , Suni, J. (VerfasserIn) , Cozzani, Giulia (VerfasserIn) , Horaites, K. (VerfasserIn) , Papadakis, K. (VerfasserIn) , Pfau-Kempf, Y. (VerfasserIn) , Tarvus, V. (VerfasserIn) , Palmroth, Minna (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 7 December 2023
In: Physics of plasmas
Year: 2023, Jahrgang: 30, Heft: 12, Pages: 1-14
ISSN:1089-7674
DOI:10.1063/5.0176376
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1063/5.0176376
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Verfasserangaben:M. Dubart, M. Battarbee, U. Ganse, A. Osmane, F. Spanier, J. Suni, G. Cozzani, K. Horaites, K. Papadakis, Y. Pfau-Kempf, V. Tarvus, M. Palmroth
Beschreibung
Zusammenfassung:Sub-grid models are key tools to accurately describe the physical processes at play in a system when high-resolution simulations are not feasible. We previously developed a sub-grid model for pitch-angle diffusion in hybrid-Vlasov simulations of Earth's magnetosphere. However, a more precise description of the pitch-angle diffusion coefficient is required to apply this model to global simulations. In this study, we use an existing method to parametrize pitch-angle diffusion coefficients from monotonic distribution functions and adapt it to bi-Maxwellian distributions. We determine these coefficients for various values of the ion temperature anisotropy and plasma β∥. We use these newly parametrized coefficients in our sub-grid model and show that it accurately models reduction of temperature anisotropy in both local simulations and global simulations of the Earth's magnetosphere, while using minimal computational resources.
Beschreibung:Gesehen am 27.05.2024
Beschreibung:Online Resource
ISSN:1089-7674
DOI:10.1063/5.0176376

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