Nonlinear simulations of solar rotation effects in supergranules |
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| Authors: | David H Hathaway |
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| Institution: | (1) Advanced Study Program/High Altitude Observatory, National Center for Atmospheric Research, 80307 Boulder, Colo., U.S.A. |
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| Abstract: | Nonlinear calculations for the three-dimensional and time dependent convective flow in a plane parallel layer of fluid are carried out with parameter values appropriate for supergranules on the Sun. A rotation vector is used which is tilted from the vertical to represent various latitudes. For the incompressible fluid used in this model the solar rotation produces turning motions sufficient to completely twist a fluid column in about one day. It is suggested that this effect will be greatly enhanced in a compressible fluid. The tilted rotation vector produces anisotropies and systematic Reynolds stresses which drive mean flows. The resulting flows produce a rotation rate which increases inward and a meridional circulation with poleward flow along the outer surface.The National Center for Atmospheric Research is sponsored by the National Science Foundation. |
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