Physics
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.464..213h&link_type=abstract
In: Proceedings of the SOHO 10/GONG 2000 Workshop: Helio- and asteroseismology at the dawn of the millennium, 2-6 October 2000,
Physics
11
Solar Convection Zone, Meridional Flows
Scientific paper
Meridional flows within the solar convection zone have been observed with both direct Doppler measurements and with local helioseismic techniques based on ring-diagram analyses and time-distance methods. Typically these mean flows are poleward with speeds of roughly 20 m s-1. Using ring-diagram analyses on a subset of the MDI Dynamics Program data, called the dense-pack data set, we find that a deviation from this general behavior occurs in 1999. A second meridional cell appears below the surface in the northern hemisphere. At the same time, the mean zonal flows do not reveal any evidence of this cell. The zonal bands or "torsional oscillations" continue their steady migration toward the equator.
Bogart Richard. S.
Haber Deborah A.
Hill F. F.
Hindman Bradley W.
Toomre Juri
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