Temporal Variation of Subsurface Flows of Active Regions

Details Temporal Variation of Subsurface Flows of Active Regions Temporal Variation of Subsurface Flows of Active Regions

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..416..115k&link_type=abstract

Solar-Stellar Dynamos as Revealed by Helio- and Asteroseismology: GONG 2008/SOHO 21 ASP Conference Series, Vol. 416, proceedings

Astronomy and Astrophysics

Astronomy

1

Scientific paper

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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