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    Fully Kinetic Simulations of Proton-beam-driven Instabilities from Parker Solar Probe Observations

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    Pezzini(2024a).pdf (1.231Mb)
    Authors
    Pezzini, L.
    Zhukov, A.N.
    Bacchini, F.
    Arrò, G.
    López, R.A.
    Micera, A.
    Innocenti, M.E.
    Lapenta, G.
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    Discipline
    Physical sciences
    Audience
    Scientific
    Date
    2024
    Metadata
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    Description
    The expanding solar wind plasma ubiquitously exhibits anisotropic nonthermal particle velocity distributions. Typically, proton velocity distribution functions (VDFs) show the presence of a core and a field-aligned beam. Novel observations made by the Parker Solar Probe (PSP) in the innermost heliosphere have revealed new complex features in the proton VDFs, namely anisotropic beams that sometimes experience perpendicular diffusion. In this study, we use a 2.5D fully kinetic simulation to investigate the stability of proton VDFs with anisotropic beams observed by PSP. Our setup consists of a core and an anisotropic beam population that drift with respect to each other. This configuration triggers a proton beam instability from which nearly parallel fast magnetosonic modes develop. Our results demonstrate that before this instability reaches saturation, the waves resonantly interact with the beam protons, causing perpendicular heating at the expense of the parallel temperature.
    Citation
    Pezzini, L.; Zhukov, A.N.; Bacchini, F.; Arrò, G.; López, R.A.; Micera, A.; Innocenti, M.E.; Lapenta, G. (2024). Fully Kinetic Simulations of Proton-beam-driven Instabilities from Parker Solar Probe Observations. , Astrophysical Journal, Vol. 975, Issue 1, A37, DOI: 10.3847/1538-4357/ad7465.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/14025
    doi: http://dx.doi.org/10.3847/1538-4357/ad7465
    url:
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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