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Solar sub-surface fluid topology provides an indirect approach to examine theinternal characteristics of active regions (ARs). Earlier studies have revealedthe prevalence of strong flows in the interior of ARs having complex magneticfields. Using the Doppler data obtained by the Global Oscillation Network Group(GONG) project for a sample of 74 ARs, we have discovered the presence of steepgradients in meridional velocity at depths ranging from 1.5 to 5 Mm in flareproductive ARs. The sample of these ARs is taken from the Carrington rotations1980--2052 covering the period August 2001-January 2007. The gradients showedan interesting hemispheric trend of negative (positive) signs in the northern(southern) hemisphere, i.e., directed toward the equator. We have discoveredthree sheared layers in the depth range of 0 - 10 Mm, providing an evidence ofcomplex flow structures in several ARs. An important inference derived from ouranalysis is that the location of the deepest zero vertical vorticity iscorrelated with the remaining life time of ARs. This new finding may beemployed as a tool for predicting the life expectancy of an AR.

Sub-Surface Meridional flow, Vorticity and the life time of Solar Active Regions