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Self-organized braiding in solar coronal loops

Part of: Focus on Space Plasmas Macroscopic Randomness

Published online by Cambridge University Press:  02 June 2015

M. A. Berger ,
M. Asgari-Targhi  and
E. E. DeLuca
M. A. Berger*
Affiliation:
CEMPS, University of Exeter, EX4 4QF, UK
M. Asgari-Targhi
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street MS-15, Cambridge, MA 02138, USA
E. E. DeLuca
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street MS-15, Cambridge, MA 02138, USA
*
†Email address for correspondence: m.berger@exeter.ac.uk
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Abstract

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In this paper, we investigate the evolution of braided solar coronal loops. We assume that coronal loops consist of several internal strands which twist and braid about each other. Reconnection between the strands leads to small flares and heating of the loop to x-ray temperatures. Using a method of generating and releasing braid structure similar to a forest fire model, we show that the reconnected field lines evolve to a self-organised critical state. In this state, the frequency distributions of coherent braid sequences as well as flare energies follow power law distributions. We demonstrate how the presence of net helicity in the loop alters the distribution laws.

Type
Research Article
Information
Journal of Plasma Physics , Volume 81 , Issue 4 , August 2015 , 395810404
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © Cambridge University Press 2015

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