Physics
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.517..163r&link_type=abstract
In: Proceedings of SOHO 12 / GONG+ 2002. Local and global helioseismology: the present and future, 27 October - 1 November 2002,
Physics
19
Convection, Granulation, Supergranulation
Scientific paper
We briefly review the main observational properties of the solar supergranulation: divergent horizontal flow, weak thermal signature, oscillatory power, and super-rotation. We present new photometric measurements which attempt to disentangle the magnetic network and convective contributions to the supergranular continuum intensity contrast, and suggest that the convective signal has now been detected with some confidence. We propose and examine a purely advective model for the supergranular flow and show that large-spatial and long-temporal supergranular (and mesogranular) scales naturally arise through the collective interaction of many small-scale and short-lived granular downflow plumes. We show that dynamically unsteady behavior in such a model can yield oscillatory power and speculate that super-rotation may be achieved given an underlying size dependent rotation rate. Finally, we discuss the uncertainties and observational predictions of this highly simplified model.
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