Deep Meridional Flow Measurements from GONG: Temporal and Depth Variations

Details Deep Meridional Flow Measurements from GONG: Temporal and Depth Variations Deep Meridional Flow Measurements from GONG: Temporal and Depth Variations

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1618k&link_type=abstract

American Astronomical Society, SPD meeting #42, #16.18; Bulletin of the American Astronomical Society, Vol. 43, 2011

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We present measurements of meridional flow using time-distance analysis of GONG data. To push the depth profile of the flow deeper, we average time-difference measurements over 15 years. In order to increase the signal-to-noise ratio, and to reduce contamination from other modes, we utilized both phase velocity and low-m filtering. This approach seems to be capable of extending the meridional-flow measurements down to 0.7 Rsun. Our preliminary results indicate that the precision achieved is very close to that required to measure the reverse flow down to the base of the solar convection zone where it is expected to be situated. Typical uncertainties for most depths within mid-latitudes are less than 0.02 seconds. At high latitudes, due to projection effects, error bars increase up to 0.06 seconds. There is a significant change in the nature of the time differences at the bottom of the convection zone.

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