Ring-diagram parameter comparisons for GONG, MDI and HMI
Howe, R.; Komm, R.; Hill, F.; González Hernández, I.; Bogart, R.; Haber, D.; Tripathy, S.
United States
Abstract
We examine the differences between ring-diagram mode frequency estimates from samples of Global Oscillation Network Group [GONG], Michelson Doppler Imager [MDI] and Helioseismic and Magnetic Imager [HMI] data, and find that different instruments and analysis pipelines do result in small systematic differences which may not be uniform across the solar disk.