Recent theoretical results on coronal heating

The scenario of magnetohydrodynamic turbulence in connection with coronal active regions has been actively investigated in recent years. According to this viewpoint, a turbulent regime is driven by footpoint motions and the incoming energy is efficiently transferred to small scales due to a direct e...

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Autores principales: Gomez, D.O., Dmitruk, P.A., Milano, L.J.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00380938_v195_n2_p299_Gomez
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spelling todo:paper_00380938_v195_n2_p299_Gomez2023-10-03T14:48:30Z Recent theoretical results on coronal heating Gomez, D.O. Dmitruk, P.A. Milano, L.J. The scenario of magnetohydrodynamic turbulence in connection with coronal active regions has been actively investigated in recent years. According to this viewpoint, a turbulent regime is driven by footpoint motions and the incoming energy is efficiently transferred to small scales due to a direct energy cascade. The development of fine scales to enhance the dissipation of either waves or DC currents is therefore a natural outcome of turbulent models. Numerical integrations of the reduced magnetohydrodynamic equations are performed to simulate the dynamics of coronal loops driven at their bases by footpoint motions. These simulations show that a stationary turbulent regime is reached after a few photospheric times, displaying a broadband power spectrum and a dissipation rate consistent with the energy loss rates of the plasma confined in these loops. Also, the functional dependence of the stationary heating rate with the physical parameters of the problem is obtained, which might be useful for an observational test of this theoretical framework. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00380938_v195_n2_p299_Gomez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description The scenario of magnetohydrodynamic turbulence in connection with coronal active regions has been actively investigated in recent years. According to this viewpoint, a turbulent regime is driven by footpoint motions and the incoming energy is efficiently transferred to small scales due to a direct energy cascade. The development of fine scales to enhance the dissipation of either waves or DC currents is therefore a natural outcome of turbulent models. Numerical integrations of the reduced magnetohydrodynamic equations are performed to simulate the dynamics of coronal loops driven at their bases by footpoint motions. These simulations show that a stationary turbulent regime is reached after a few photospheric times, displaying a broadband power spectrum and a dissipation rate consistent with the energy loss rates of the plasma confined in these loops. Also, the functional dependence of the stationary heating rate with the physical parameters of the problem is obtained, which might be useful for an observational test of this theoretical framework.
format JOUR
author Gomez, D.O.
Dmitruk, P.A.
Milano, L.J.
spellingShingle Gomez, D.O.
Dmitruk, P.A.
Milano, L.J.
Recent theoretical results on coronal heating
author_facet Gomez, D.O.
Dmitruk, P.A.
Milano, L.J.
author_sort Gomez, D.O.
title Recent theoretical results on coronal heating
title_short Recent theoretical results on coronal heating
title_full Recent theoretical results on coronal heating
title_fullStr Recent theoretical results on coronal heating
title_full_unstemmed Recent theoretical results on coronal heating
title_sort recent theoretical results on coronal heating
url http://hdl.handle.net/20.500.12110/paper_00380938_v195_n2_p299_Gomez
work_keys_str_mv AT gomezdo recenttheoreticalresultsoncoronalheating
AT dmitrukpa recenttheoreticalresultsoncoronalheating
AT milanolj recenttheoreticalresultsoncoronalheating
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