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The published Mount Wilson Doppler-shift measurements of the solar velocityfield taken in 1967--1982 are revisited with a more accurate model, whichincludes two terms representing the meridional flow and three termscorresponding to the convective limb shift. Integration of the recomputed dataover the visible hemisphere reveals significant variability of the net radialvelocity at characteristic time scales of 0.1--10 years, with a standarddeviation of 1.4 \ms. This result is supported by independent publishedobservations. The implications for exoplanet detection include reducedsensitivity of the Doppler method to Earth-like planets in the habitable zone,and an elevated probability of false detections at periods of a few to severalyears.

Variability of surface flows on the Sun and the implications for exoplanet detection