Convectively driven vortex flows in the Sun

Details Convectively driven vortex flows in the Sun Convectively driven vortex flows in the Sun

2008-09-23

arxiv.org/abs/0809.3885v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJL. An animation showing one of the whirlpools can be found at http://www.iac.es/proyecto/solarh

Scientific paper

10.1086/593329

We have discovered small whirlpools in the Sun, with a size similar to the terrestrial hurricanes (<~0.5 Mm). The theory of solar convection predicts them, but they had remained elusive so far. The vortex flows are created at the downdrafts where the plasma returns to the solar interior after cooling down, and we detect them because some magnetic bright points (BPs) follow a logarithmic spiral in their way to be engulfed by a downdraft. Our disk center observations show 0.009 vortexes per Mm^2, with a lifetime of the order of 5 min, and with no preferred sense of rotation. They are not evenly spread out over the surface, but they seem to trace the supergranulation and the mesogranulation. These observed properties are strongly biased by our type of measurement, unable to detect vortexes except when they are engulfing magnetic BPs.

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