Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.0406m&link_type=abstract
American Astronomical Society, SPD meeting #40, #4.06; Bulletin of the American Astronomical Society, Vol. 41, p.810
Astronomy and Astrophysics
Astronomy
Scientific paper
Turbulent dynamos tend to generate turbulent magnetic fields. The Sun exhibits such disordered fields but it also exhibits large-scale magnetic activity patterns of striking order, including cyclically varying sunspot distributions and a reversing dipole moment. The challenge of global solar dynamo theory is to account for such order. Rotational shear almost certainly plays an essential role, placing the solar tachocline at center stage. Here we present global simulations of convective dynamos with and without a tachocline, focusing on how the presence of a tachocline alters mean field generation. The presence of a tachocline not only promotes the generation of mean toroidal flux, but it also enhances and stabilizes the mean poloidal field throughout the convection zone, promoting dipolar structure with less frequent polarity reversals. Magnetic fields generated in the presence of a tachocline are more helical overall, with opposite senses among hemispheres and among mean and fluctuating components. Toroidal tachocline fields exhibit little indication of magnetic buoyancy instabilities but may be undergoing magneto-shear instabilities.
Brown Benjamin P.
Browning Matthew K.
Brun Allan Sacha
Miesch Mark S.
Toomre Juri
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