Simulation of a Solar Jet Formed from an Untwisting Flux Rope Interacting with a Null Point
Coronal jets are eruptions identified by a collimated, sometimes twisted spire. They are small-scale energetic events compared with flares. Using multiwavelength observations from the Solar Dynamics Observatory/Atmospheric Imaging Assembly and a magnetogram from Hinode/Spectro-Polarimeter (Hinode/SP...
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IOP Publishing
2023-01-01
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Series: | The Astrophysical Journal |
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Online Access: | https://doi.org/10.3847/1538-4357/acc9a7 |
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author | Jiahao Zhu Yang Guo Mingde Ding Brigitte Schmieder |
author_facet | Jiahao Zhu Yang Guo Mingde Ding Brigitte Schmieder |
author_sort | Jiahao Zhu |
collection | DOAJ |
description | Coronal jets are eruptions identified by a collimated, sometimes twisted spire. They are small-scale energetic events compared with flares. Using multiwavelength observations from the Solar Dynamics Observatory/Atmospheric Imaging Assembly and a magnetogram from Hinode/Spectro-Polarimeter (Hinode/SP), we study the formation and evolution of a jet occurring on 2019 March 22 in NOAA Active Region 12736. A zero- β magnetohydrodynamic simulation is conducted to probe the initiation mechanisms and appearance of helical motion during this jet event. As the simulation reveals, there are two pairs of field lines at the jet base, indicating two distinct magnetic structures. One structure outlines a flux rope lying low above the photosphere in the north of a bald patch region, and the other structure shows a null point high in the corona in the south. The untwisting motions of the observed flux rope were recovered by adding an anomalous (artificial) resistivity in the simulation. A reconnection occurs at the bald patch in the flux rope structure, which is moving upward and simultaneously encounters the field lines of the null point structure. The interaction of the two structures results in the jet, while the twist of the flux rope is transferred to the jet by the reconnected field lines. The rotational motion of the flux rope is proposed to be an underlying trigger of this process and responsible for helical motions in the jet spire. |
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spelling | doaj.art-f009e0e892cd466ebf07d79d0f9b4d662023-09-03T13:36:47ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-019491210.3847/1538-4357/acc9a7Simulation of a Solar Jet Formed from an Untwisting Flux Rope Interacting with a Null PointJiahao Zhu0https://orcid.org/0000-0003-4239-8101Yang Guo1https://orcid.org/0000-0002-9293-8439Mingde Ding2https://orcid.org/0000-0002-4978-4972Brigitte Schmieder3https://orcid.org/0000-0003-3364-9183School of Astronomy and Space Science and Key Laboratory for Modern Astronomy and Astrophysics, Nanjing University , Nanjing 210023, People's Republic of China ; guoyang@nju.edu.cnSchool of Astronomy and Space Science and Key Laboratory for Modern Astronomy and Astrophysics, Nanjing University , Nanjing 210023, People's Republic of China ; guoyang@nju.edu.cnSchool of Astronomy and Space Science and Key Laboratory for Modern Astronomy and Astrophysics, Nanjing University , Nanjing 210023, People's Republic of China ; guoyang@nju.edu.cnLESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris , 5 place Jules Janssen, F-92190 Meudon, France; Centre for Mathematical Plasma Astrophysics , Dept. of Mathematics, KU Leuven, B-3001 Leuven, Belgium; University of Glasgow , School of Physics and Astronomy, Glasgow, G128QQ, UKCoronal jets are eruptions identified by a collimated, sometimes twisted spire. They are small-scale energetic events compared with flares. Using multiwavelength observations from the Solar Dynamics Observatory/Atmospheric Imaging Assembly and a magnetogram from Hinode/Spectro-Polarimeter (Hinode/SP), we study the formation and evolution of a jet occurring on 2019 March 22 in NOAA Active Region 12736. A zero- β magnetohydrodynamic simulation is conducted to probe the initiation mechanisms and appearance of helical motion during this jet event. As the simulation reveals, there are two pairs of field lines at the jet base, indicating two distinct magnetic structures. One structure outlines a flux rope lying low above the photosphere in the north of a bald patch region, and the other structure shows a null point high in the corona in the south. The untwisting motions of the observed flux rope were recovered by adding an anomalous (artificial) resistivity in the simulation. A reconnection occurs at the bald patch in the flux rope structure, which is moving upward and simultaneously encounters the field lines of the null point structure. The interaction of the two structures results in the jet, while the twist of the flux rope is transferred to the jet by the reconnected field lines. The rotational motion of the flux rope is proposed to be an underlying trigger of this process and responsible for helical motions in the jet spire.https://doi.org/10.3847/1538-4357/acc9a7Solar magnetic fieldsSolar magnetic reconnectionMagnetohydrodynamicsSolar activitySolar active regions |
spellingShingle | Jiahao Zhu Yang Guo Mingde Ding Brigitte Schmieder Simulation of a Solar Jet Formed from an Untwisting Flux Rope Interacting with a Null Point The Astrophysical Journal Solar magnetic fields Solar magnetic reconnection Magnetohydrodynamics Solar activity Solar active regions |
title | Simulation of a Solar Jet Formed from an Untwisting Flux Rope Interacting with a Null Point |
title_full | Simulation of a Solar Jet Formed from an Untwisting Flux Rope Interacting with a Null Point |
title_fullStr | Simulation of a Solar Jet Formed from an Untwisting Flux Rope Interacting with a Null Point |
title_full_unstemmed | Simulation of a Solar Jet Formed from an Untwisting Flux Rope Interacting with a Null Point |
title_short | Simulation of a Solar Jet Formed from an Untwisting Flux Rope Interacting with a Null Point |
title_sort | simulation of a solar jet formed from an untwisting flux rope interacting with a null point |
topic | Solar magnetic fields Solar magnetic reconnection Magnetohydrodynamics Solar activity Solar active regions |
url | https://doi.org/10.3847/1538-4357/acc9a7 |
work_keys_str_mv | AT jiahaozhu simulationofasolarjetformedfromanuntwistingfluxropeinteractingwithanullpoint AT yangguo simulationofasolarjetformedfromanuntwistingfluxropeinteractingwithanullpoint AT mingdeding simulationofasolarjetformedfromanuntwistingfluxropeinteractingwithanullpoint AT brigitteschmieder simulationofasolarjetformedfromanuntwistingfluxropeinteractingwithanullpoint |