Comparison of HMI Dopplergrams with GONG and MDI data
Howe, R.; Komm, R.; Hill, F.; González Hernández, I.; Jain, K.; Bogart, R.
United States
Abstract
We compare sample Dopplergrams from the Helioseismic and Magnetic Imager, the Michelson Doppler Imager and the Global Oscillation Network Group. Each instrument has a distinct static velocity patterm across the disk; once this has been subtracted and the images interpolated to a common grid, the agreement is satisfactory.