Other
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.0503g&link_type=abstract
American Astronomical Society, SPD meeting #37, #5.03; Bulletin of the American Astronomical Society, Vol. 38, p.223
Other
Scientific paper
Recent time-distance helioseismology results suggest that supergranulation has properties of travelling waves. The supergranular pattern rotates faster than the surface plasma or any other features on the Sun. We investigate possible mechanisms of the wave-like behaviour of supergranulation. In particular, we suggest that this may be caused by the steep gradient of the subsurface shear layer. Using a linear model, we calculated the phase speed of unstable modes of convection. The speeds were found to depend on the stratification of the convective layer. The phase speeds of the linear convective modes were greater than the surface plasma speed, though lower than observations. An alternate suggested explanation is a non-linear effect of the Coriolis force. We analyzed the results of non-linear 3D simulations of the convection zone including solar rotation, and found no evidence of wave-like behaviour. These results suggest that the subsurface shear layer is a plausible explanation for the wave-like behaviour, but the non-linear effects need to be studied.
Green Cristina A.
Kosovichev Aleksandr G.
Miesch Mark S.
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