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Numerical Simulation of Helical Jets at Active Region Peripheries

Wyper, Peter F; DeVore, C Richard; Antiochos, Spiro K

Numerical Simulation of Helical Jets at Active Region Peripheries Thumbnail


C Richard DeVore

Spiro K Antiochos


Coronal jets are observed above minority polarity intrusions throughout the solar corona. Some of the most energetic occur on the periphery of active regions where the magnetic field is strongly inclined. These jets exhibit a non-radial propagation in the low corona as they follow the inclined field, and often have a broad, helical shape. We present a three-dimensional magnetohydrodynamic simulation of such an active-region-periphery helical jet. We consider an initially potential field with a bipolar flux distribution embedded in a highly inclined magnetic field, representative of the field nearby an active region. The flux of the minority polarity sits below a bald-patch separatrix initially. Surface motions are used to inject free energy into the closed field beneath the separatrix, forming a sigmoidal flux rope which eventually erupts producing a helical jet. We find that a null point replaces the bald patch early in the evolution and that the eruption results from a combination of magnetic breakout and an ideal kinking of the erupting flux rope. We discuss how the two mechanisms are coupled, and compare our results with previous simulations of coronal-hole jets. This comparison supports the hypothesis that the generic mechanism for all coronal jets is a coupling between breakout reconnection and an ideal instability. We further show that our results are in good qualitative and quantitative agreement with observations of active-region periphery jets.


Wyper, P. F., DeVore, C. R., & Antiochos, S. K. (2019). Numerical Simulation of Helical Jets at Active Region Peripheries. Monthly Notices of the Royal Astronomical Society, 490(3), 3679-3690.

Journal Article Type Article
Acceptance Date Sep 19, 2019
Online Publication Date Oct 3, 2019
Publication Date Dec 31, 2019
Deposit Date Oct 4, 2019
Publicly Available Date Oct 4, 2019
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 490
Issue 3
Pages 3679-3690


Accepted Journal Article (2.4 Mb)

Copyright Statement
This article has been accepted for publication in the Monthly notices of the Royal Astronomical Society ©: 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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