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Hinode's EUV Imaging Spectrometer (EIS) has discovered ubiquitous outflows ofa few to 50 km/sec from active regions (ARs). These outflows are most prominentat the AR boundary and appear over monopolar magnetic areas. They are linked tostrong non-thermal line broadening and are stronger in hotter EUV lines. Theoutflows persist for at least several days. Using Hinode EIS and X-RayTelescope observations of AR 10942 coupled with magnetic modeling, wedemonstrate that the outflows originate from specific locations of the magnetictopology where field lines display strong gradients of magnetic connectivity,namely quasi-separatrix layers (QSLs), or in the limit of infinitely thin QSLs,separatrices. We found the strongest AR outflows to be in the vicinity of QSLsections located over areas of strong magnetic field. We argue that magneticreconnection at QSLs separating closed field lines of the AR and eitherlarge-scale externally connected or `open' field lines is a viable mechanismfor driving AR outflows which are likely sources of the slow solar wind.

Magnetic Reconnection along Quasi-Separatrix Layers as a Driver of Ubiquitous Active Region Outflows