Excitation and Damping of Slow Magnetosonic Waves in Flaring Hot Coronal Loops: Effects of Compressive Viscosity

Abstract

Slow magnetosonic waves associated with flares were observed in coronal loops by SOHO/SUMER, SDO/AIA in various EUV bandpasses, and other instruments. The excitation and damping of slow magnetosonic waves provides information on the magnetic, temperature, and density structure of the loops. Recently, it was found using 1.5D models that the thermal conduction is suppressed and compressive viscosity is enhanced in hot (T>6 MK) flaring coronal loops. We model the excitation and dissipation of slow magnetosonic waves in hot coronal loops with realistic magnetic geometry, enhanced density, and temperature (compared to background corona) guided by EUV observations using 3D MHD visco-resistive model. The effects of compressive viscosity tensor component along the magnetic field are included with classical and enhanced viscosity coefficient values for the first time in 3D MHD coronal loop model. The waves are excited by a velocity pulse at the footpoint of the loop at coronal lower boundary. The modeling results demonstrate the excitation of the slow magnetosonic waves and nonlinear coupling to other wave modes, such as the kink and fast magnetosonic. We find significant leakage of the waves from the hot coronal loops with small effect of viscous dissipation in cooler (6MK) loops, and more significant effects of viscous dissipation in hotter (10.5MK) coronal loops. Our results demonstrate that nonlinear 3D MHD models are required to fully account for various wave couplings, damping, standing wave formation, and viscous dissipation in hot flaring coronal loops. Our viscous 3D MHD code provides a new tool for improved coronal seismology.

Accepted for publication in The Astrophysical Journal

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Cited by in corpus (10)

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• Coronal seismology by slow waves in non-adiabatic conditions
• Plasma heating and nanoflare caused by slow-mode wave in a coronal loop
• Exact solution to the problem of slow oscillations in coronal loops and its diagnostic applications
• Nonlinear Fast Magnetosonic Waves in Solar Prominence Pillars
• Non-local thermal transport impact on compressive waves in two-temperature coronal loops
• Particle acceleration by sub-proton cyclotron frequency spectrum of dispersive Alfven waves in inhomogeneous solar coronal plasmas
• Modeling the Excitation, Propagation and Damping of Quasi-Periodic Fast Magnetosonic Waves in Realistic Coronal Active Region Magnetic Field Structures
• Data-driven Radiative Magnetohydrodynamics Simulations with the MURaM Code: Coronal Heating and Dynamics in an Emerging Active Region
• Exploring Standing and Reflected Slow-mode Waves in Flaring Coronal Loops: A Parametric Study Using 2.5D MHD Modeling