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Durham University

Department of Mathematical Sciences

Academic Staff

Publication details for Peter Wyper

Doyle, Lauren, Wyper, Peter F., Scullion, Eamon, McLaughlin, James A., Ramsay, Gavin & Doyle, J. Gerard (2019). Observations and 3D Magnetohydrodynamic Modeling of a Confined Helical Jet Launched by a Filament Eruption. The Astrophysical Journal 887(2): 246.

Author(s) from Durham

Abstract

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.