Helioseismic Observations of Solar Convection Zone Dynamics

The large-scale dynamics of the solar convection zone have been inferred using both global and local helioseismology applied to data from the Global Oscillation Network Group (GONG) and the Michelson Doppler Imager (MDI) on board SOHO. The global analysis has revealed temporal variations of the “tor...

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Bibliographic Details
Published in:Proceedings of the International Astronomical Union 2010-06, Vol.6 (S271), p.15-22
Main Authors: Hill, Frank, Howe, Rachel, Komm, Rudi, Hernández, Irene González, Kholikov, Shukur, Leibacher, John
Format: Article
Language:English
Subjects:
Astronomy
Contributed Papers
Solar physics
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Summary:The large-scale dynamics of the solar convection zone have been inferred using both global and local helioseismology applied to data from the Global Oscillation Network Group (GONG) and the Michelson Doppler Imager (MDI) on board SOHO. The global analysis has revealed temporal variations of the “torsional oscillation” zonal flow as a function of depth, which may be related to the properties of the solar cycle. The horizontal flow field as a function of heliographic position and depth can be derived from ring diagrams, and shows near-surface meridional flows that change over the activity cycle. Time-distance techniques can be used to infer the deep meridional flow, which is important for flux-transport dynamo models. Temporal variations of the vorticity can be used to investigate the production of flare activity. This paper summarizes the state of our knowledge in these areas.
ISSN:1743-9213
1743-9221
DOI:10.1017/S174392131101742X