Subsurface Zonal Flows of Active and Quiet Regions

Details Subsurface Zonal Flows of Active and Quiet Regions Subsurface Zonal Flows of Active and Quiet Regions

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..416..123k&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

Scientific paper

We study the zonal flow in solar subsurface layers, analyzing about six years of GONG+ high-resolution Doppler data with a ring-diagram analysis. We focus on the variation of the zonal flow with magnetic activity over a range of depths from the surface to about 16 Mm. We calculate the average zonal flow for a quiet- and an active-region subset defined as dense-pack locations with an unsigned magnetic flux less than 3.4 G and locations with greater than 65.0 G respectively. The average zonal flow of active regions is about 4 ms-1 faster than the average flow of quiet regions and this difference increases slightly with increasing depth at depths greater than about 5 Mm. The difference shows no apparent pattern in time and latitude; it shows no variation with the solar cycle.

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