Direct pixel-by-pixel comparison of 4-hour time series of Fe I 617.3 nm line-of-sight velocities from SO/PHI-HRT and SDO/HMI during Sun-Earth line crossing yields slope 0.96, 92% correlation, and formation-height difference of 7±14 km after alignment and large-scale velocity removal.
W., Skumanich, A., & Martinez Pillet, V
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Solar photospheric velocities measured in space: a comparison between SO/PHI-HRT and SDO/HMI
Direct pixel-by-pixel comparison of 4-hour time series of Fe I 617.3 nm line-of-sight velocities from SO/PHI-HRT and SDO/HMI during Sun-Earth line crossing yields slope 0.96, 92% correlation, and formation-height difference of 7±14 km after alignment and large-scale velocity removal.