Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2217m&link_type=abstract
American Astronomical Society Meeting 210, #22.17; Bulletin of the American Astronomical Society, Vol. 39, p.127
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the highest-resolution simulations of global-scale solar convection so far achieved, dealing with turbulent compressible flows interacting with rotation in a full spherical shell. The three-dimensional simulation domain extends from 0.71R-0.98R, close enough to the photosphere to overlap with solar subsurface weather (SSW) maps inferred from local helioseismology. The convective patterns achieved are complex and continually evolving on a time scale of several days. However, embedded within the intricate downflow network near the surface are coherent downflow lanes associated with giant cells which persist for weeks to months and which extend through much of the convection zone. These coherent downflow lanes are generally confined to low latitudes and are oriented in a north-south direction. The low dissipation in these simulations permits a more realistic balance of forces which yields differential rotation and meridional circulation profiles in good agreement with those inferred from helioseismology.
Brun Allan Sacha
de Rosa Marc L.
Miesch Mark S.
Toomre Juri
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