Large-Scale Horizontal Flows from Soup Observations of Solar Granulation
PHILLIPS LAB HANSCOM AFB MA
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Using high-resolution time-sequence photographs of solar granulation from the SOUP experiment on Spacelab 2, we have observed large-scale horizontal flows in the solar surface. Our measurement method is based upon a local spatial cross correlation analysis. The horizontal motions have amplitudes in the range 300 to 1000 ms. Radial outflow of granulation from a sunspot penumbra into surrounding photosphere is a striking new discover. We see both the supergraulation pattern and cellular structures having the scale of mesogranulation. 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.