NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Simulations of Solar Jets Confined by Coronal LoopsCoronal 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 there connection 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.
Document ID
20170002686
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Wyper, P. F.
(Oak Ridge Associated Universities Greenbelt, MD, United States)
De Vore, C. R.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
March 29, 2017
Publication Date
March 21, 2016
Publication Information
Publication: The Astrophysical Journal
Publisher: IOP Science
Volume: 820
Issue: 1
ISSN: 2041-8205
e-ISSN: 2041-8213
Subject Category
Solar Physics
Report/Patent Number
GSFC-E-DAA-TN40780
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available