Vorticity and Divergence in the Solar Photosphere

Details Vorticity and Divergence in the Solar Photosphere Vorticity and Divergence in the Solar Photosphere

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...447..419w&link_type=abstract

Astrophysical Journal v.447, p.419

Astronomy and Astrophysics

Astronomy

27

Hydrodynamics, Sun: Atmosphere, Sun: Granulation

Scientific paper

We have studied an outstanding sequence of continuum images of the solar granulation from Pic du Midi Observatory. We have calculated the horizontal vector flow field using a correlation tracking algorithm, and from this determined three scalar fields: the vertical component of the curl, the horizontal divergence, and the horizontal flow speed. The divergence field has substantially longer coherence time and more power than does the curl field. Statistically, curl is better correlated with regions of negative divergence that is, the vertical vorticity is higher in downflow regions, suggesting excess vorticity in intergranular lanes. The average value of the divergence is largest (i.e., outflow is largest) where the horizontal speed is large; we associate these regions with exploding granules. A numerical simulation of general convection also shows similar statistical differences between curl and divergence. Some individual small bright points in the granulation pattern show large local vorticities.

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