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Energy release in driven twisted coronal loops

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Date
01/2016
Author
Bareford, Michael R
Gordovskyy, Mykola
Browning, Philippa
Hood, Alan William
Keywords
Corona
Instabilities
Magnetic fields
Magnetohydrodynamics
QB Astronomy
QA Mathematics
QC Physics
NDAS
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Abstract
Magnetic reconnection in twisted magnetic flux tubes, representing coronal loops, is investigated. The main goal is to establish the influence of the field geometry and various thermodynamic effects on the stability of twisted flux tubes and on the size and distribution of heated regions. In particular, we aim to investigate to what extent the earlier idealised models, based on the initially cylindrically symmetric flux tubes, are different from more realistic models, including the large-scale curvature, atmospheric stratification, thermal conduction and other effects. In addition, we compare the roles of Ohmic heating and shock heating in energy conversion during magnetic reconnection in twisted loops. The models with straight flux tubes show similar distribution of heated plasma during the reconnection: it initially forms a helical shape, which subsequently becomes very fragmented. The heating in these models is rather uniformly distributed along flux tubes. At the same time, the hot plasma regions in curved loops are asymmetric, and concentrate close to the loop tops. Large-scale curvature has a destabilising in influence: lower twist is needed for instability. Footpoint convergence normally delays instability slightly, although, in some cases converging flux tubes can be less stable. Finally, introducing a stratified atmosphere gives rise to decaying wave propagation, which has destabilising effect.
Citation
Bareford , M R , Gordovskyy , M , Browning , P & Hood , A W 2016 , ' Energy release in driven twisted coronal loops ' , Solar Physics , vol. 291 , no. 1 , pp. 187-209 . https://doi.org/10.1007/s11207-015-0824-7
Publication
Solar Physics
Status
Peer reviewed
DOI
https://doi.org/10.1007/s11207-015-0824-7
ISSN
0038-0938
Type
Journal article
Rights
© 2016, Publisher / the Author(s). This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at link.springer.com / https://dx.doi.org/10.1007/s11207-015-0824-7
Description
This work is funded by Science and Technology Facilities Council (UK). This equipment was funded by a BIS National E-Infrastructure capital grant ST/K00042X/1, DiRAC Operations grant ST/K003267/1 and Durham University.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/12305

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