Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2216f&link_type=abstract
American Astronomical Society Meeting 210, #22.16; Bulletin of the American Astronomical Society, Vol. 39, p.127
Astronomy and Astrophysics
Astronomy
Scientific paper
The turbulent solar convection zone exhibits a range of scales of convection which are visible at the solar surface, ranging from granules ( 1 Mm) to supergranules ( 30 Mm). Numerical simulations of solar convection carried out in full-spherical shells consistently reveal even larger scales of convection, termed giant cells, which may span a few hundred Mm in the horizontal and extend throughout the depth of the convection zone. Recent correlation tracking of supergranular motions has revealed the tendency of supergranules to align themselves in the north-south direction. This alignment may be due to organization by larger-scale giant-cell motions and is generally weak, with the strongest alignment occurring at low latitudes. Using f-mode time-distance helioseismology, we have probed the flow signals associated with the presence of these giant cells and have found good agreement with the results from previous correlation tracking studies. Moreover, we find that the horizontal divergence of our measured flows exhibit particularly striking alignment at larger scales.
Featherstone Nicholas
Haber Deborah A.
Hindman Bradley W.
Toomre Juri
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