Computer Science
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..17e...1t&link_type=abstract
Highlights of Recent Progress in the Seismology of the Sun and Sun-Like Stars, 26th meeting of the IAU, Joint Discussion 17, 23
Computer Science
Scientific paper
The nearly continuous full-disk imaging of solar resonant oscillations with both the ground-based Global Oscillation Network Group (GONG) and the space-based Michelson Doppler Imager (MDI) on SOHO have yielded detailed inferences about differential rotation, meridional circulations, and large-scale streaming flows within the solar convection zone. Of particular interest has been the evolution of such dynamical structures, and their coupling to magnetism, variously in the tachocline of rotational shear at its base and in the near-surface shear layer. We review properties of such dynamics involving variations in rotation rates near the tachocline, of propagating banded features in the differential rotation in the upper reaches of the convection zone, and of evolving patterns in the circulations there. In addition, local helioseismic probing shows the presence of striking subsurface flows appearing variously as meandering jets and a wide range of structured and possibly cellular flows. These samplings of dynamics proceeding within the solar convection zone provides challenges and inspiration for three-dimensional simulations of turbulent convection, rotation and magnetism in spherical shells now enabled by massively-parallel supercomputers. We review the interplay between features emerging from such high-resolution simulations of the solar convection zone and the richness of dynamics being revealed by helioseismic probing. The simulations now make good contact with differential rotation profiles so deduced in the bulk of the convection zone. Yet all models possess complex downflow structures that extend over most of that zone. Such large-scale convection so evident in global simulations may now have been identified in the helioseismic data, with simulations guiding the manner in which the elusive giant cells may be detected amidst the intense flows of supergranulation.
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