On the Origin of the Solar Mesogranulation

Details On the Origin of the Solar Mesogranulation On the Origin of the Solar Mesogranulation

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...563l..91c&link_type=abstract

The Astrophysical Journal, Volume 563, Issue 1, pp. L91-L94.

Astronomy and Astrophysics

Astronomy

33

Sun: Granulation, Sun: Magnetic Fields, Sun: Photosphere

Scientific paper

The observed properties of mesogranules are related to structures found in idealized numerical experiments on turbulent convection. We describe results obtained for three-dimensional Boussinesq convection in a layer with a very large aspect ratio. There are two distinct cellular patterns at the surface. Energy-transporting convection cells (corresponding to granules in the solar photosphere) have diameters comparable to the layer depth, while macrocells (corresponding to mesogranules) are several times larger. The motion acts as a small-scale turbulent dynamo, generating a disordered magnetic field that is concentrated at macrocellular corners and, to a lesser extent, in the lanes that join them. These results imply that mesogranules owe their origin to collective interactions between the granules.

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