Helioseismic Measurements of the Subsurface Meridional Flow

Details Helioseismic Measurements of the Subsurface Meridional Flow Helioseismic Measurements of the Subsurface Meridional Flow

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...508l.105b&link_type=abstract

The Astrophysical Journal, Volume 508, Issue 1, pp. L105-L108.

Astronomy and Astrophysics

Astronomy

87

Sun: Interior, Sun: Oscillations

Scientific paper

We measure the mean frequencies of acoustic (p-mode) waves propagating toward and away from the poles of the Sun from observations made with the Solar Oscillations Investigation-Michelson Doppler Imager on board the Solar and Heliospheric Observatory and the ground-based Global Oscillations Network Group. We demonstrate that there is a significant frequency shift between poleward- and equatorward-traveling waves measured over solar latitudes 20 deg-60 deg, which is consistent with the Doppler effect of a poleward meridional flow on the order of 10 m s^-1. From the variation of the frequency shifts of p-modes with degree l between 72 and 882 as a function of the lower turning point depth, we infer the speed of the meridional flow, averaged over these latitudes, over a range in depth extending over the top half of the solar convection zone. We find no evidence for a significant equatorward return flow within this depth range.

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