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Abstract:

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.

Registro:

Documento: Artículo
Título:Two-dimensional cellular automaton model for the evolution of active region coronal plasmas
Autor:Fuentes, M.L.; Klimchuk, J.A.
Filiación:Instituto de Astronoḿa y Física del Espacio, CONICET-UBA, CC. 67, Suc. 28, Buenos Aires, 1428, Argentina
NASA Goddard Space Flight Center, Code 671, Greenbelt, MD 20771, United States
Palabras clave:Sun: Activity; Sun: Corona; Sun: Magnetic fields; Sun: X-rays, gamma rays
Año:2015
Volumen:799
Número:2
DOI: http://dx.doi.org/10.1088/0004-637X/799/2/128
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v799_n2_p_Fuentes

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Citas:

---------- APA ----------
Fuentes, M.L. & Klimchuk, J.A. (2015) . Two-dimensional cellular automaton model for the evolution of active region coronal plasmas. Astrophysical Journal, 799(2).
http://dx.doi.org/10.1088/0004-637X/799/2/128
---------- CHICAGO ----------
Fuentes, M.L., Klimchuk, J.A. "Two-dimensional cellular automaton model for the evolution of active region coronal plasmas" . Astrophysical Journal 799, no. 2 (2015).
http://dx.doi.org/10.1088/0004-637X/799/2/128
---------- MLA ----------
Fuentes, M.L., Klimchuk, J.A. "Two-dimensional cellular automaton model for the evolution of active region coronal plasmas" . Astrophysical Journal, vol. 799, no. 2, 2015.
http://dx.doi.org/10.1088/0004-637X/799/2/128
---------- VANCOUVER ----------
Fuentes, M.L., Klimchuk, J.A. Two-dimensional cellular automaton model for the evolution of active region coronal plasmas. Astrophys. J. 2015;799(2).
http://dx.doi.org/10.1088/0004-637X/799/2/128