Structure and Evolution of Giant Cells in Global Models of Solar Convection

By Mark S. Miesch, A. Brun, M. DeRosa, J. Toomre. 2007

196 citations recorded by the source corpus.

The global scales of solar convection are studied through three-dimensional simulations of compressible convection carried out in spherical shells of rotating fluid that extend from the base of the convection zone to within 15 Mm of the photosphere. Such modeling at the highest spatial resolution to date allows study of distinctly turbulent convection, revealing that coherent downflow structures associated with giant cells continue to play a significant role in maintaining the differential rotation that is achieved. These giant cells at lower latitudes exhibit prograde propagation relative to the mean zonal flow, or differential rotation, that they establish, and retrograde propagation of more isotropic structures with vortical character at mid and high latitudes. The interstices of the downflow networks often possess strong and compact cyclonic flows. The evolving giant-cell downflow systems can be partly masked by the intense smaller scales of convection driven closer to the surface, yet they are likely to be detectable with the helioseismic probing that is now becoming available. Indeed, the meandering streams and varying cellular subsurface flows revealed by helioseismology must be sampling contributions from the giant cells, yet it is difficult to separate out these signals from those attributed to the faster horizontal flows of supergranulation. To aid in such detection, we use our simulations to describe how the properties of giant cells may be expected to vary with depth and how their patterns evolve in time.

Subfields: Astronomy and Astrophysics, Molecular Biology

View Paper: https://www.semanticscholar.org/paper/4e0ff679e667ad8387da2c54f83a9880413428da

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Citations in the corpus

Solar Interior Rotation and its Variation (2009, background): “…of convection (Brun et al., 2004, for example, ) still show some tendency towards rotation on cylinders, but the higherresolution calculation of Miesch et al. (2008) mostly eliminates the cylindrical effect and produces a rotation pattern, based on giant convection cells, that after suitable…”
MAGNETIC CYCLES IN A CONVECTIVE DYNAMO SIMULATION OF A YOUNG SOLAR-TYPE STAR (2011, background): “In the solar convection zone, density stratification is of fundamental importance and the rotational influence is moderate (Rossby number Ro∼ 1), giving rise to intricate, threedimensional, highly turbulent convective structures spanning many spatial and temporal scales (Miesch et al. 2008).”
The Sun’s Supergranulation (2010, background): “Simulations of solar-like convective shells by Miesch et al. (2008) at higher spherical harmonics resolution (Lmax = 682) have further revealed the presence of intense cyclonic downdrafts at scales comparable to those of giant cells, a very likely signature of interactions between large-scale…”
MAGNETIC WREATHS AND CYCLES IN CONVECTIVE DYNAMOS (2012, background): “Miesch et al. (2006, 2008) have explored the interplay of rotation, stratification, and moderately turbulent convection to produce strong differential rotation in a hydrodynamic setting.”