Meridional Flow Measurements from 15 Years of GONG Spherical Harmonic Time Series

Details Meridional Flow Measurements from 15 Years of GONG Spherical Harmonic Time Series Meridional Flow Measurements from 15 Years of GONG Spherical Harmonic Time Series

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640003l&link_type=abstract

American Astronomical Society, AAS Meeting #216, #400.03; Bulletin of the American Astronomical Society, Vol. 41, p.855

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Scientific paper

We present the results of a meridional flow time-distance analysis based on GONG data. In order to increase the signal-to-noise ratio, and to reduce contamination from other modes, we utilize a low-m filtering technique, which seems capable of extending the meridional flow measurements down to the deep layers of the convection zone (0.7R°). 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. To avoid projection effects at high latitudes, and to extend the analysis to higher latitudes, we analyze extreme B-angle time periods separately. We discuss the significance of temporal variations of meridional flow in the presence of additional flows around active regions.

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