Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.0701w&link_type=abstract
American Astronomical Society, SPD meeting #40, #7.01; Bulletin of the American Astronomical Society, Vol. 41, p.812
Astronomy and Astrophysics
Astronomy
Scientific paper
Helioseismic correlation data computed from a sequence of SOHO/MDI high resolution Doppler images were inverted for subphotospheric flow on horizontal scales ranging from 45 Mm down to 5 Mm. The measurements are sensitive to flows over a depth range of roughly one Mm. The resulting seismically-reconstructed and directly-observed photospheric Doppler velocity maps are similar for horizontal scales less than about 15 Mm, as was seen in previous studies of supergranulation-scale flow.
For smaller scales it becomes difficult to see directly-observed Doppler features in the seismic maps. But regression analysis of the maps does reveal a component of subsurface flow which correlates with the photospheric flow. The ratio of the seismically-inferred to directly-observed Doppler velocity is typically 0.7 to 0.8, indicating a slight decrease in the flow velocity with depth in the first megameter below the photosphere. This finding is consistent with the results of the recent convection simulations of Benson, Stein, and Nordlund.
This work is supported by NASA contract NNH07CD06C.
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