Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.0805a&link_type=abstract
American Astronomical Society, SPD meeting #40, #8.05; Bulletin of the American Astronomical Society, Vol. 41, p.816
Astronomy and Astrophysics
Astronomy
Scientific paper
Vigorous fluid motions associated with the observed patterns of supergranulation, mesogranulation, and granulation play a large role in the turbulent transport of heat to the solar surface. The downflows associated with these convective motions plunge from the surface into the near-surface layers of the Sun bringing cooler, low entropy material with them. These flow structures may provide some stochastic effects upon the dynamics of the giant cells of deep convection that extend into the near-surface regions. To investigate such dynamics, we have carried out several 3-D numerical simulations of fully compressible fluids within curved, spherical segments that, at this stage, approximate conditions near the top of the rotating solar convection zone. The upper boundary of the segment is stochastically driven with cool plumes that approximate the spatial and temporal scales of supergranular cell downflows, in essence creating a network of supergranular cells. The segment spans 30° in latitude and 30° in longitude, and has a radial extent of 15% of the solar radius. We explore the formation and evolution of the boundary layer resulting from such stochastic driving, and discuss these dynamics in the context of the near-surface shear layer of the solar convection zone.
Augustson Kyle
de Rosa Marc L.
Hurlburt Neal E.
Toomre Juri
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