Paper:	Analysis of Active Region 11339 using Multi-Spectral Data
Volume:	478, Fifty Years of Seismology of the Sun and Stars
Page:	237
Authors:	Tripathy, S. C.; Jain, K.; Howe, R.; Bogart, R. S.; Basu, S.; Hill, F.
Abstract:	We apply the local helioseismic technique of ring-diagrams to Doppler and intensity images from Helioseismic Magnetic Imager and Atmospheric Imaging Assembly on board the Solar Dynamics Observatory and investigate the variation in high-degree mode frequencies and sub-surface flows of a complex active region 11339. After subtracting the frequencies of the quiet region from the active region, we find a reasonable agreement between the frequencies measured from different observables. We also observe that the depth profiles of zonal and meridional components of the horizontal subsurface flow agree with each other within three sigma if the contribution of quiet regions is removed.

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