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
Publicado: 2015
Materias:
Sun: Activity
Sun: Corona
Sun: Magnetic fields
Sun: X-rays, gamma rays
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v799_n2_p_Fuentes
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 paper:paper_0004637X_v799_n2_p_Fuentes
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spelling paper:paper_0004637X_v799_n2_p_Fuentes2023-06-08T14:29:13Z Two-dimensional cellular automaton model for the evolution of active region coronal plasmas 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. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v799_n2_p_Fuentes 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
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.
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
publishDate 2015
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v799_n2_p_Fuentes
http://hdl.handle.net/20.500.12110/paper_0004637X_v799_n2_p_Fuentes
_version_ 1768544436748288000

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