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- W10403657 abstract "▪We used simultaneous observations obtained with the Ni I 676.8 nm, (GONG) K I 769.9 nm (MOTH) and Na I D2 589.0 nm (MOTH) lines. The continuous MOTH dopplergrams were obtained at the South Pole during Austral summer of 2002-03 and GONG dopplergrams are the merged images observed at six network stations around the globe. Here we use data for the period Jan 17-20, 2003. ▪We used the ring-diagram technique to calculate subsurface velocity fields. Prior to the analysis, the data sets were reconciled in order to minimize differences arising from the various image geometries, reduced the resolution of GONG images by a factor of 2 to approximate the MOTH resolution and changed the cadence of MOTH images to 60 seconds. ▪We calculated the angular correlation of MOTH images with that of GONG and accordingly changed the offset angle (Figure 1). The angular offset changes with time, introducing a spurious flow field that appears as a rotation of the solar image about the center of the disk (Figure 2). This artifact is substantially reduced after the MOTH image rotation has been removed. ▪We tracked and remapped 137 regions 30o x 30o across the disk for 1440 min. This is different from the standard dense pack analysis, where 189 regions of 15o x 15o are considered. The bigger size patch is considered because of the low resolution of the images and to recover maximum number of modes in the analysis. Does the inference of Solar Subsurface Flow Change with Choice of the Spectral Line?" @default.
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- W10403657 date "2006-10-01" @default.
- W10403657 modified "2023-09-27" @default.
- W10403657 title "Does the inference of solar subsurface flow change with choice of the spectral line" @default.
- W10403657 hasPublicationYear "2006" @default.
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