The shape of twisted, line-tied coronal loops

Details The shape of twisted, line-tied coronal loops The shape of twisted, line-tied coronal loops

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..124..271b&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 124, no. 2, 1989, p. 271-288. Research supported by the Royal Society and SERC.

Physics

27

Coronal Loops, Photosphere, Solar Magnetic Field, Current Density, Iterative Solution, Magnetic Field Configurations, Magnetohydrodynamics

Scientific paper

The magnetostatic equilibrium of a coronal loop in response to slow twisting of the photospheric footpoints is investigated. A numerical code is used to solve the full nonlinear two-dimensional axisymmetric problem, extending earlier linearized models which assume weak twist and large aspect ratio. It is found that often the core of the loop tends to contract into a region of strong longitudinal field while the outer part expands. It is shown that, away from the photospheric footpoints, the equilibrium is very well approximated by a straight one-dimensional cylindrical model. This idea is used to develop a simple method for prescribing the footpoint angular displacement and calculating the equilibrium.

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