Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh11b..07w&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH11B-07
Astronomy and Astrophysics
Astrophysics
[7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields
Scientific paper
Convective turbulence is known to maintain a state of differential rotation within the Sun's outer convective envelope, and also drives the Sun's meridional circulation. Yet the radiation zone beneath is found to rotate uniformly, separated from the convection zone by a thin shear-layer called the tachocline. This uniform rotation can be explained by the presence of a global scale magnetic field within the radiation zone, provided that (i) this magnetic field remains confined to the radiation zone against diffusion and (ii) the meridional circulations within the convection zone and tachocline are prevented from burrowing into the radiation zone. In high latitudes, the meridional circulation is expected to be downward within the tachocline, and can hold the internal magnetic field in advective--diffusive balance across a thin "magnetic confinement layer" at the base of the tachocline (Gough & McIntyre 1998). We present progress in extending the Gough & McIntyre picture to cover the crucial polar region, and describe modifications to the model arising from compositional stratification in the outer radiation zone
McIntyre Michael E.
Wood Terri
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