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Horizontal Flows in the Photosphere and Subphotosphere of Two Active Regions View all abstracts by submitter

Yang Liu   Submitted: 2012-07-23 11:57

We compare horizontal flow fields in the photosphere and subphotosphere a layer of 0.5 Mm below the photosphere in two solar active regions: AR11084 and AR11158. AR11084 is a mature, simple active region without significant flaring activities, and AR11158 is a multipolar, complex active region with magnetic flux emerging during the period studied. Flows in the photosphere are derived by applying the method of Differential Affine Velocity Estimator for Vector Magnetograms (DAVE4VM) on HMI observed vector magnetic fields, and the subphotospheric flows are inferred by time ? distance helioseismology using HMI observed Doppergrams. Similar flow patterns are found for both layers for AR11084: inward flows in sunspot umbra and outward flows surrounding the sunspot. The boundary between the inward and outward flows, which is slightly different in the photosphere and the subphotosphere, is within the sunspot penumbra. The area having inward flows in the subphotosphere is larger than that in the photosphere. For AR11158, flows in these two layers show great similarities in some areas and significant differences in other areas. Both layers exhibit consistent outward flows in the areas surrounding sunspots. On the other hand, most well-documented flux-emergence-related flow features seen in the photosphere do not have their counterparts in the subphotosphere. This implies that the horizontal flows caused by flux emergence do not extend deeply into the subsurface.

Authors: Yang Liu, Junwei Zhao, Peter W. Schuck
Projects: SDO-HMI

Publication Status: Accepted by Solar Physics
Last Modified: 2012-07-24 11:02
Go to main E-Print page  First observation of a transverse vertical oscillation during the formation of a hot post flare loop  Magnetic topology of Active Regions and Coronal Holes: Implications for Coronal Outflows and the Solar Wind  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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