Angular momentum transport in the solar supergranulation layer

Details Angular momentum transport in the solar supergranulation layer Angular momentum transport in the solar supergranulation layer

2002-07-16

arxiv.org/abs/astro-ph/0207330v1

Astronomy and Astrophysics

Astrophysics

3 pages, 5 figures, IAU Coll. 188: Magnetic coupling of the solar atmosphere, Santorini

Scientific paper

The eddy viscosity in the solar supergranulation layer is derived from the observed rotational shear by computing theoretical rotation laws for the outermost parts of the solar convection zone using the results from numerical simulations of rotating convection as input. By varying the eddy viscosity, the results can be tuned to match the observations. The value of 1.5 X 10^13 cm^2/s found for the eddy viscosity is considerably larger than the eddy magnetic diffusivity derived from the sunspot decay. The results are checked by comparison of the horizontal cross correlations of the velocity fluctuations with the observed Ward profile.

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