Turbulent photospheric motions drive the solar magnetic field to twist and tangle, making magnetic stresses continuously grow in the corona. Thin magnetic flux tubes can become kink-unstable and magnetic energy can be released through impulsive and widespread heating events. It has been recently established that the kink-instability can propagate to nearby flux tubes and determine an avalanche process to involve larger scale coronal loops. The initial helical current sheet progressively fragments in a turbulent way into smaller scale sheets. Their turbulent dissipation lead to a sequence of a-periodic heat pulses, similar to nanoflare storms. These magnetic processes are highly dynamic and non linear, and can be modelled with time-dependent 3D magnetohydrodynamic simulations on high performance computing systems. Predictions to compare with solar observations require advances on two fronts. Modelling must include all important physical ingredients and a complete plasma atmosphere to derive realistic observables. The observations must resolve into sufficiently small temporal and spatial scales in the relevant spectral bands. Cozzo et al. (2023) describes a detailed 3D MHD model which allows for the derivation of observables in the EUV band. The EUV spectrometer on the forth-coming MUSE mission is tailored for probing plasma structure and dynamics at sub-arcsecond resolution with sampling rates of few seconds. In this work we show preliminary EUV diagnostics of the scenario obtained from our model for the MUSE mission.

Cozzo, G.; Pagano, P.; Reale, F.; Reid, J.; Hood, A.W.; Testa, P.; Martinez-Sykora, J.; De Pontieu, B.; Petralia, A.; Argiroffi, C. (25-28 June 2024).MUSE EUV spectroscopy of a kink-unstable coronal loops system.

MUSE EUV spectroscopy of a kink-unstable coronal loops system

Gabriele Cozzo;Paolo Pagano;Fabio Reale;Costanza Argiroffi

Abstract

Turbulent photospheric motions drive the solar magnetic field to twist and tangle, making magnetic stresses continuously grow in the corona. Thin magnetic flux tubes can become kink-unstable and magnetic energy can be released through impulsive and widespread heating events. It has been recently established that the kink-instability can propagate to nearby flux tubes and determine an avalanche process to involve larger scale coronal loops. The initial helical current sheet progressively fragments in a turbulent way into smaller scale sheets. Their turbulent dissipation lead to a sequence of a-periodic heat pulses, similar to nanoflare storms. These magnetic processes are highly dynamic and non linear, and can be modelled with time-dependent 3D magnetohydrodynamic simulations on high performance computing systems. Predictions to compare with solar observations require advances on two fronts. Modelling must include all important physical ingredients and a complete plasma atmosphere to derive realistic observables. The observations must resolve into sufficiently small temporal and spatial scales in the relevant spectral bands. Cozzo et al. (2023) describes a detailed 3D MHD model which allows for the derivation of observables in the EUV band. The EUV spectrometer on the forth-coming MUSE mission is tailored for probing plasma structure and dynamics at sub-arcsecond resolution with sampling rates of few seconds. In this work we show preliminary EUV diagnostics of the scenario obtained from our model for the MUSE mission.
coronal-loops solar-corona MHD EUV spectroscopy MUSE-mission
Cozzo, G.; Pagano, P.; Reale, F.; Reid, J.; Hood, A.W.; Testa, P.; Martinez-Sykora, J.; De Pontieu, B.; Petralia, A.; Argiroffi, C. (25-28 June 2024).MUSE EUV spectroscopy of a kink-unstable coronal loops system.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/646713
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