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Time-dependent Data-driven Modeling of Active Region Evolution Using Energy-optimized Photospheric Electric Fields

In this work, we present results of a time-dependent data-driven numerical simulation developed to study the dynamics of coronal active region magnetic fields. The evolving boundary condition driving the model, the photospheric electric field, is inverted using a time sequence of vector magnetograms...

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Autores principales: Pomoell, Jens, Lumme, Erkka, Kilpua, Emilia
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Netherlands 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6459003/
https://www.ncbi.nlm.nih.gov/pubmed/31057187
http://dx.doi.org/10.1007/s11207-019-1430-x
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author Pomoell, Jens
Lumme, Erkka
Kilpua, Emilia
author_facet Pomoell, Jens
Lumme, Erkka
Kilpua, Emilia
author_sort Pomoell, Jens
collection PubMed
description In this work, we present results of a time-dependent data-driven numerical simulation developed to study the dynamics of coronal active region magnetic fields. The evolving boundary condition driving the model, the photospheric electric field, is inverted using a time sequence of vector magnetograms as input. We invert three distinct electric field datasets for a single active region. All three electric fields reproduce the observed evolution of the normal component of the magnetic field. Two of the datasets are constructed so as to match the energy input into the corona to that provided by a reference estimate. Using the three inversions as input to a time-dependent magnetofrictional model, we study the response of the coronal magnetic field to the driving electric fields. The simulations reveal the magnetic field evolution to be sensitive to the input electric field despite the normal component of the magnetic field evolving identically and the total energy injection being largely similar. Thus, we demonstrate that the total energy injection is not sufficient to characterize the evolution of the coronal magnetic field: coronal evolution can be very different despite similar energy injections. We find the relative helicity to be an important additional metric that allows one to distinguish the simulations. In particular, the simulation with the highest relative helicity content produces a coronal flux rope that subsequently erupts, largely in agreement with extreme-ultraviolet imaging observations of the corresponding event. Our results suggest that time-dependent data-driven simulations that employ carefully constructed driving boundary conditions offer a valuable tool for modeling and characterizing the evolution of coronal magnetic fields. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1007/s11207-019-1430-x) contains supplementary material, which is available to authorized users.
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spelling pubmed-64590032019-05-03 Time-dependent Data-driven Modeling of Active Region Evolution Using Energy-optimized Photospheric Electric Fields Pomoell, Jens Lumme, Erkka Kilpua, Emilia Sol Phys Article In this work, we present results of a time-dependent data-driven numerical simulation developed to study the dynamics of coronal active region magnetic fields. The evolving boundary condition driving the model, the photospheric electric field, is inverted using a time sequence of vector magnetograms as input. We invert three distinct electric field datasets for a single active region. All three electric fields reproduce the observed evolution of the normal component of the magnetic field. Two of the datasets are constructed so as to match the energy input into the corona to that provided by a reference estimate. Using the three inversions as input to a time-dependent magnetofrictional model, we study the response of the coronal magnetic field to the driving electric fields. The simulations reveal the magnetic field evolution to be sensitive to the input electric field despite the normal component of the magnetic field evolving identically and the total energy injection being largely similar. Thus, we demonstrate that the total energy injection is not sufficient to characterize the evolution of the coronal magnetic field: coronal evolution can be very different despite similar energy injections. We find the relative helicity to be an important additional metric that allows one to distinguish the simulations. In particular, the simulation with the highest relative helicity content produces a coronal flux rope that subsequently erupts, largely in agreement with extreme-ultraviolet imaging observations of the corresponding event. Our results suggest that time-dependent data-driven simulations that employ carefully constructed driving boundary conditions offer a valuable tool for modeling and characterizing the evolution of coronal magnetic fields. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1007/s11207-019-1430-x) contains supplementary material, which is available to authorized users. Springer Netherlands 2019-04-10 2019 /pmc/articles/PMC6459003/ /pubmed/31057187 http://dx.doi.org/10.1007/s11207-019-1430-x Text en © The Author(s) 2019 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Article
Pomoell, Jens
Lumme, Erkka
Kilpua, Emilia
Time-dependent Data-driven Modeling of Active Region Evolution Using Energy-optimized Photospheric Electric Fields
title Time-dependent Data-driven Modeling of Active Region Evolution Using Energy-optimized Photospheric Electric Fields
title_full Time-dependent Data-driven Modeling of Active Region Evolution Using Energy-optimized Photospheric Electric Fields
title_fullStr Time-dependent Data-driven Modeling of Active Region Evolution Using Energy-optimized Photospheric Electric Fields
title_full_unstemmed Time-dependent Data-driven Modeling of Active Region Evolution Using Energy-optimized Photospheric Electric Fields
title_short Time-dependent Data-driven Modeling of Active Region Evolution Using Energy-optimized Photospheric Electric Fields
title_sort time-dependent data-driven modeling of active region evolution using energy-optimized photospheric electric fields
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6459003/
https://www.ncbi.nlm.nih.gov/pubmed/31057187
http://dx.doi.org/10.1007/s11207-019-1430-x
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