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Paper: Subsurface Zonal Flows of Active and Quiet Regions
Volume: 416, Solar-Stellar Dynamos as Revealed by Helio- and Asteroseismology: GONG 2008/SOHO 21
Page: 123
Authors: Komm, R.; Howe, R.; Hill, F.; González Hernández, I.
Abstract: 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 m/s 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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