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On the shape of force–free field lines in the solar corona

Abstract:

This paper studies the shape parameters of looped field lines in a linear force-free magnetic field. Loop structures with a sufficient amount of kinking are generally seen to form S or inverse S (Z) shapes in the corona (as viewed in projection). For a single field line, we can ask how much the field line is kinked (as measured by the writhe), and how much neighbouring flux twists about the line (as measured by the twist number). The magnetic helicity of a flux element surrounding the field l...

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Publication date:
2011-01-01
URN:
uuid:4c9e40d4-1920-415c-9eaa-d7024f7277fa
Local pid:
oai:eprints.maths.ox.ac.uk:1468

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