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Observations and 3D magnetohydrodynamic modeling of a confined helical jet launched by a filament eruption.

Doyle, Lauren and Wyper, Peter F. and Scullion, Eamon and McLaughlin, James A. and Ramsay, Gavin and Doyle, J. Gerard (2019) 'Observations and 3D magnetohydrodynamic modeling of a confined helical jet launched by a filament eruption.', The astrophysical journal., 887 (2). p. 246.


We present a detailed analysis of a confined filament eruption and jet associated with a C1.5 class solar flare. Multiwavelength observations from the Global Oscillations Network Group and Solar Dynamics Observatory reveal the filament forming over several days following the emergence and then partial cancellation of a minority polarity spot within a decaying bipolar active region. The emergence is also associated with the formation of a 3D null point separatrix that surrounds the minority polarity. The filament eruption occurs concurrently with brightenings adjacent to and below the filament, suggestive of breakout and flare reconnection, respectively. The erupting filament material becomes partially transferred into a strong outflow jet (∼60 km s−1 ) along coronal loops, becoming guided back toward the surface. Utilizing high-resolution Hα observations from the Swedish Solar Telescope/CRisp Imaging SpectroPolarimeter, we construct velocity maps of the outflows, demonstrating their highly structured but broadly helical nature. We contrast the observations with a 3D magnetohydrodynamic simulation of a breakout jet in a closed-field background and find close qualitative agreement. We conclude that the suggested model provides an intuitive mechanism for transferring twist/helicity in confined filament eruptions, thus validating the applicability of the breakout model not only to jets and coronal mass ejections but also to confined eruptions and flares.

Item Type:Article
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Publisher statement:Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI
Date accepted:26 November 2019
Date deposited:15 January 2020
Date of first online publication:26 December 2019
Date first made open access:15 January 2020

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