Solar Supergranulation as Propagating Waves

Details Solar Supergranulation as Propagating Waves Solar Supergranulation as Propagating Waves

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp11c..03g&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SP11C-03

Physics

7522 Helioseismology, 7529 Photosphere, 7544 Stellar Interiors And Dynamo Theory

Scientific paper

It has been observed that the supergranulation pattern on the surface of the Sun appears to rotate faster than the photospheric plasma and magnetic features. It is postulated that this could be due to instabilities in the subsurface convective shear layer. This behaviour is modelled, starting with a linearized system of differential equations describing a convectively unstable region containing a horizontal shear flow. The system is solved numerically, using parameters drawn from the solar model and helioseismic inversions and assuming linear and non-linear shear flow profiles, for a range of wavenumbers. The phase speeds of the resulting wave solutions are found to be greater than the surface speed, possibly explaining the observed behaviour.

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