National Solar ObservatoryGlobal Oscillation Network Group |
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GONG+ Local Helioseismology (2003)
Ring diagram analysis uses 3-dimensional power spectra from small patches of the solar disk to follow local flows below the surface. Such analysis (Hill, 1988) has previously been extensively used on the ‘Dynamics’ data from the MDI instrument aboard SOHO (e.g., Haber et al 2002). The pipeline to produce ring diagrams and inferred subsurface flow patterns from GONG+ data has now been implemented, and 29 days of merged images have been analyzed, from 2002-03-28 to 2002-04-26, corresponding to Carrington Rotation 1988. 189 overlapping 15-degree patches were analyzed for each 1644-minute ‘day’, as in the dense-pack analysis of Haber et al.
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