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Paper: Recent Results on Solar Interior Meridional Flow from SDO/HMI
Volume: 478, Fifty Years of Seismology of the Sun and Stars
Page: 243
Authors: Zhao, J.
Abstract: Since the launch of Solar Dynamics Observatory, the Helioseismic and Magnetic Imager has accumulated 3 years of continuous observations. Using time-distance helioseismology, we have obtained new results on both global and local scales. Here, I review recent results on the solar interior meridional flow. After correcting the recently identified systematic center-to-limb effect, we have detected the long-sought equatorward flow in the solar interior, starting at about 0.91 R and extending to about 0.82 R, with a maximum speed of 8 m/s. Our analysis also reveals evidence that there are at least two meridional circulation cells in the radial direction, with another poleward flow zone residing between 0.75 and 0.82 R. This result require a reconsideration of some solar dynamo models that were built based on a single circulation cell. The shallower meridional flow shows clear temporal variations that are highly correlated with the magnetic activities.
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