Wavelike Properties of Solar Supergranulation Detected in Doppler Shift Data

Abstract

Recently, Gizon, Duvall, {\amp} Schou suggested that supergranulationhas a wavelike component. In this Letter, I show that the same phenomenoncan be observed using surface Doppler shift data, thereby confirmingtheir observations, which were made using a helioseismic time-distancetechnique. In addition to confirming those results, I show that thewave motion is predominantly longitudinal (the fluid displacementis in the direction of propagation), and I am able to extend theresults for the rotation and the meridional flow beyond +/-70{\deg}latitude. The meridional flow results, which extend further thanprevious helioseismic measurements, appear to show no sign of a secondcell.