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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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