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Session 2 - Everything Else.
Display session, Friday, June 27
Ballroom C, Chair: Richard Canfield

[2.80] Preliminary Results Towards a Synoptic Velocity Map of the Solar Subsurface

I. G. Hernandez, J. Patron (Instituto de Astrofisica de Canarias), R. S. Bogart (Stanford University), D. A. Haber (Joint Institute for Laboratory Astrophysics, University of Colorado, Boulder), F. Hill (National Solar Observatory), The SOI Team (Stanford University)

The study of large scale velocity flows near the solar surface may be very useful to clarify many aspects of solar convection and dynamo theories. In this sense, the "Ring Diagram Analysis", a technique applied to tridimensional power spectra of the solar oscillations, has shown to be a good method to get information about horizontal velocity flows in the upper layers of the convection zone.

This work presents the results obtained using this analysis with several regions of about 15 heliographic degrees over the solar surface, as a first step towards a synoptic velocity map of the solar surface with depth dependence.

The data used are solar images taken with MDI (Michelson Doppler Imager) on board of SOHO (Solar Oscillation Investigation) during its Dynamics Program. These images are full-disc Dopplergrams with a resolution of 2 arcsec. The regions are located at different positions over the solar surface and have been tracked over a time span of 1536 minutes.


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