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Simulations of Solar Jets Confined by Coronal Loops

Wyper, P.; DeVore, C.R.

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C.R. DeVore


Coronal jets are collimated, dynamic events that occur over a broad range of spatial scales in the solar corona. In the open magnetic field of coronal holes, jets form quasi-radial spires that can extend far out into the heliosphere, while in closed-field regions the jet outflows are confined to the corona. We explore the application of the embedded-bipole model to jets occurring in closed coronal loops. In this model, magnetic free energy is injected slowly by footpoint motions that introduce twist within the closed dome of the jet source region, and is released rapidly by the onset of an ideal kink-like instability. Two length scales characterize the system: the width (N) of the jet source region and the footpoint separation (L) of the coronal loop that envelops the jet source. We find that both the conditions for initiation and the subsequent dynamics are highly sensitive to the ratio L/N. The longest-lasting and most energetic jets occur along long coronal loops with large L/N ratios, and share many of the features of open-field jets, while smaller L/N ratios produce shorter-duration, less energetic jets that are affected by reflections from the far-loop footpoint. We quantify the transition between these behaviors and show that our model replicates key qualitative and quantitative aspects of both quiet Sun and active-region loop jets. We also find that the reconnection between the closed dome and surrounding coronal loop is very extensive: the cumulative reconnected flux at least matches the total flux beneath the dome for small L/N, and is more than double that value for large L/N.


Wyper, P., & DeVore, C. (2016). Simulations of Solar Jets Confined by Coronal Loops. Astrophysical Journal, 820(1), Article 77.

Journal Article Type Article
Acceptance Date Feb 2, 2016
Online Publication Date Mar 21, 2016
Publication Date Mar 21, 2016
Deposit Date Oct 18, 2016
Publicly Available Date Jan 26, 2017
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 820
Issue 1
Article Number 77


Published Journal Article (2.6 Mb)

Copyright Statement
© 2016. The American Astronomical Society. All rights reserved.

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