Solar Interior Meridional Flows using Zonal Modes from GONG

Details Solar Interior Meridional Flows using Zonal Modes from GONG Solar Interior Meridional Flows using Zonal Modes from GONG

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp41a..07l&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SP41A-07

Physics

7522 Helioseismology

Scientific paper

We present two different time-distance techniques to measure meridional-flow-induced travel-time differences. We use GONG zonal spherical harmonic coefficients ( m = 0 ) and longitude-averaged time series for the 1995 -- 2007 time period. Both data sets represents isolated waves propagating only in the North -- South direction. We demonstrate that it is possible to obtain travel-time differences with lower turning point about 200 Mm, which correspond to the tachocline region. We do not see any evidence of equatorward flow.

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