Large-scale horizontal flows from SOUP observations of solar granulation

Physics

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Horizontal Orientation, Magnetohydrodynamic Flow, Solar Granulation, Solar Oscillations, Sunspots, Astronomical Photography, Benard Cells, Cross Correlation, Penumbras, Solar Atmosphere

Scientific paper

Using high-resolution time-sequence photographs of solar granulation from the SOUP experiment on Spacelab 2 the authors observed large-scale horizontal flows in the solar surface. The measurement method is based upon a local spatial cross correlation analysis. The horizontal motions have amplitudes in the range 300 to 1000 m/s. Radial outflow of granulation from a sunspot penumbra into the surrounding photosphere is a striking new discovery. Both the supergranulation pattern and cellular structures having the scale of mesogranulation are seen. The vertical flows that are inferred by continuity of mass from these observed horizontal flows have larger upflow amplitudes in cell centers than downflow amplitudes at cell boundaries.

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