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Paper: Large-scale Flows in Subsurface Layers
Volume: 346, Large-scale Structures and their Role in Solar Activity
Page: 33
Authors: Komm, R.; Howe, R.; Hernandez, I.G.; Hill, F.; Toner, C.
Abstract: We analyze Global Oscillation Network Group (GONG) observations obtained during 14 consecutive Carrington rotations CR 1979{1992. We use a ring-diagram technique in order to measure the zonal and meridional flow components in the upper solar convection zone from the near-surface layers to 16 Mm in depth and derive the vertical velocity component assuming mass conservation. The average flows show the patterns that are expected as solar-cycle related variations. For example, the vertical flow shows downflows near the mean latitude of activity and upflows near the equator. This long-term pattern seems to be the net effect of flows at locations that do not coincide with strong active regions. Locations of strong active regions show downflows at depths less than about 12 Mm on average and strong upflows at greater depths independent of latitude. At these locations, the zonal flow is faster on average than the average flow over regions with less magnetic activity.
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