Facultad de Ciencias Físicas y Matemáticas

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Browsing Facultad de Ciencias Físicas y Matemáticas by Subject "Absorption"

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    Resonant absorption of the kink mode in a coronal plasma slab via 2D hybrid-PIC simulations: multifluid and kinetic descriptions.
    (Universidad de Concepción, 2026) Carril Pardo, Hugo Alexis; Navarro Maldonado, Roberto Elías; Terradas Calafell, Jaume
    We investigate the resonant absorption kink oscillations in a plasma slab with linearly inhomogeneous particle densities. Different thicknesses of the layers and angles of the background magnetic field to the plane of the slab are studied via 2D−3V PIChybrid simulations. We identify the resonant absorption of the large-scale mode in the inhomogeneous layers and compare its damping rate with a single fluid, linear MHD estimation. Scales in the order of the proton inertial length are achieved in most of the simulated cases, particularly in the case of thinner layers and for moderately magnetized slabs. Quasi-perpendicular fluctuations consistent with Kinetic Alfv´en Waves (KAWs) are generated at the layers only when resonant absorption occurs. The KAWs interact non-linearly and generate a parallel electric field, which subsequently produces density structures and accelerates protons. This causes strong heating and flat-topped distribution. We derive an analytical estimate for this parallel field that reproduces the most relevant signals of the dispersion relations during and after resonant absorption. The transverse particle dynamics are driven by the cross-field drift, causing the transverse temperature to oscillate and grow exponentially due to small-scale fluctuations. Therefore, the proton distribution functions are largely shaped non-resonantly by the KAW activity.
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