Two-dimensional cellular automaton model for the evolution of active region coronal plasmas

We study a two-dimensional cellular automaton (CA) model for the evolution of coronal loop plasmas. The model is based on the idea that coronal loops are made of elementary magnetic strands that are tangled and stressed by the displacement of their footpoints by photospheric motions. The magnetic st...

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Detalles Bibliográficos
Autores principales:	Fuentes, M.L., Klimchuk, J.A.
Formato:	JOUR
Materias:	Sun: Activity Sun: Corona Sun: Magnetic fields Sun: X-rays, gamma rays
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_0004637X_v799_n2_p_Fuentes
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_0004637X_v799_n2_p_Fuentes
record_format	dspace
spelling	todo:paper_0004637X_v799_n2_p_Fuentes2023-10-03T14:02:36Z Two-dimensional cellular automaton model for the evolution of active region coronal plasmas Fuentes, M.L. Klimchuk, J.A. Sun: Activity Sun: Corona Sun: Magnetic fields Sun: X-rays, gamma rays We study a two-dimensional cellular automaton (CA) model for the evolution of coronal loop plasmas. The model is based on the idea that coronal loops are made of elementary magnetic strands that are tangled and stressed by the displacement of their footpoints by photospheric motions. The magnetic stress accumulated between neighbor strands is released in sudden reconnection events or nanoflares that heat the plasma. We combine the CA model with the Enthalpy Based Thermal Evolution of Loops model to compute the response of the plasma to the heating events. Using the known response of the X-Ray Telescope on board Hinode, we also obtain synthetic data. The model obeys easy-to-understand scaling laws relating the output (nanoflare energy, temperature, density, intensity) to the input parameters (field strength, strand length, critical misalignment angle). The nanoflares have a powerlaw distribution with a universal slope of -2.5, independent of the input parameters. The repetition frequency of nanoflares, expressed in terms of the plasma cooling time, increases with strand length. We discuss the implications of our results for the problem of heating and evolution of active region coronal plasmas. © 2015. The American Astronomical Society. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0004637X_v799_n2_p_Fuentes
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Sun: Activity Sun: Corona Sun: Magnetic fields Sun: X-rays, gamma rays
spellingShingle	Sun: Activity Sun: Corona Sun: Magnetic fields Sun: X-rays, gamma rays Fuentes, M.L. Klimchuk, J.A. Two-dimensional cellular automaton model for the evolution of active region coronal plasmas
topic_facet	Sun: Activity Sun: Corona Sun: Magnetic fields Sun: X-rays, gamma rays
description	We study a two-dimensional cellular automaton (CA) model for the evolution of coronal loop plasmas. The model is based on the idea that coronal loops are made of elementary magnetic strands that are tangled and stressed by the displacement of their footpoints by photospheric motions. The magnetic stress accumulated between neighbor strands is released in sudden reconnection events or nanoflares that heat the plasma. We combine the CA model with the Enthalpy Based Thermal Evolution of Loops model to compute the response of the plasma to the heating events. Using the known response of the X-Ray Telescope on board Hinode, we also obtain synthetic data. The model obeys easy-to-understand scaling laws relating the output (nanoflare energy, temperature, density, intensity) to the input parameters (field strength, strand length, critical misalignment angle). The nanoflares have a powerlaw distribution with a universal slope of -2.5, independent of the input parameters. The repetition frequency of nanoflares, expressed in terms of the plasma cooling time, increases with strand length. We discuss the implications of our results for the problem of heating and evolution of active region coronal plasmas. © 2015. The American Astronomical Society. All rights reserved.
format	JOUR
author	Fuentes, M.L. Klimchuk, J.A.
author_facet	Fuentes, M.L. Klimchuk, J.A.
author_sort	Fuentes, M.L.
title	Two-dimensional cellular automaton model for the evolution of active region coronal plasmas
title_short	Two-dimensional cellular automaton model for the evolution of active region coronal plasmas
title_full	Two-dimensional cellular automaton model for the evolution of active region coronal plasmas
title_fullStr	Two-dimensional cellular automaton model for the evolution of active region coronal plasmas
title_full_unstemmed	Two-dimensional cellular automaton model for the evolution of active region coronal plasmas
title_sort	two-dimensional cellular automaton model for the evolution of active region coronal plasmas
url	http://hdl.handle.net/20.500.12110/paper_0004637X_v799_n2_p_Fuentes
work_keys_str_mv	AT fuentesml twodimensionalcellularautomatonmodelfortheevolutionofactiveregioncoronalplasmas AT klimchukja twodimensionalcellularautomatonmodelfortheevolutionofactiveregioncoronalplasmas
_version_	1807323157970812928

Two-dimensional cellular automaton model for the evolution of active region coronal plasmas

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