Numerical simulations of rotating sunspots

Botha, Gert, Rucklidge, Alistair, Busse, F. H. and Hurlburt, Neal (2006) Numerical simulations of rotating sunspots. In: Proceedings of SOHO-17 ‘10 Years of SOHO and Beyond’. ESA SP, 617 . ESA Publications Division, ESTEC, Noordwijk, The Netherlands. ISBN 978-9290929284

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A numerical model of idealized, axisymmetric, rotating sunspots is presented. The model contains a compressible plasma described by the nonlinear MHD equations, with density and temperature gradients simulating the upper layer of the sun’s convection zone. The solution forms a central flux tube in the cylindrical numerical domain, with convection cells pushing the magnetic field to the axis. When the numerical domain is rotated with a constant angular velocity, the umbra rotates as a rigid body while the surrounding convection cells show a swirling, vortical flow. As a result, the azimuthal velocity and magnetic field have their maximum values close to the flux tube, inside the innermost convection cell.

Item Type: Book Section
Additional Information: Proceedings of SOHO-17 ‘10 Years of SOHO and Beyond’
Subjects: F500 Astronomy
G900 Others in Mathematical and Computing Sciences
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Dr Gert Botha
Date Deposited: 14 Jan 2013 10:05
Last Modified: 17 Dec 2023 14:03

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