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| Paper: |
Temporal Variation of Subsurface Flows of Active Regions |
| Volume: |
416, Solar-Stellar Dynamos as Revealed by Helio- and Asteroseismology: GONG 2008/SOHO 21 |
| Page: |
115 |
| Authors: |
Komm, R.; Howe, R.; Hill, F. |
| Abstract: |
We study the temporal variation of subsurface flows associated
with 955 active regions. The subsurface kinetic helicity density
varies with the magnetic flux and its values at deeper layers
are correlated with the total flare intensity. The average
vertical velocity shows a downflow at depths shallower than
about 12 Mm and upflows at greater depth. Daily ring-diagram
measurements thus confirm previous synoptic measurements. In
addition we find, that at some depths, the crosscorrelation
between the vertical velocity and the unsigned magnetic flux
is positive at negative lag time. This implies that the
temporal variation of the vertical velocity might be a
precursor of flux changes.
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