Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.4605g&link_type=abstract
American Astronomical Society Meeting 210, #46.05; Bulletin of the American Astronomical Society, Vol. 39, p.161
Other
Scientific paper
Supergranular convective cells on the Sun rotate faster than surface plasma or any other feature. Recent time-distance helioseismology results suggest that supergranulation also has properties of travelling waves. We had suggested that these properties may be due to the steep gradient of the subsurface shear layer, and had calculated the phase speeds of the unstable convective modes, using a linear model. These phase speeds were greater than the speed of the surface plasma; however, they were significantly lower than the observed speed of the supergranular pattern. We now consider the contributions of viscosity and magnetic field. Adding either of these to the previous linear model can produce phase speeds matching the observations. We consider different viscosity and magnetic field profiles, and investigate if the observed phase speeds can be reproduced with realistic viscosity or magnetic fields.
Green Cristina
Kosovichev Aleksandr G.
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