@misc{The HMI Consortium: Stanford University (USA)_NASA Goddard Space Flight Center (USA)_Lockheed Martin Solar and Astrophysics Laboratory (USA)_National Center for Atmospheric Research (USA)_2024, title={SDO/HMI line-of-sight Dopplergram, 45-Second Data}, url={https://hpde.io/NASA/NumericalData/SDO/HMI/LOS_Dopplergram/PT45S.html}, DOI={10.48322/E9DG-YP34}, abstractNote={Dopplergrams are maps of solar surface velocity. The HMI (Camera 2) instrument takes 72 filtergrams to construct a single dopplergram. Six filtergrams are taken in six positions across the nominal 6173.3 Å spectral line; each filtergram is taken in two polarization states (right circularly polarized (RCP), or Stokes I-V, and left circularly polarized (LCP), or I+V). Assuming that the absorption line is a Gaussian and that the HMI filter transmission profiles are delta functions, the Fourier coefficients can be calculated and are then used to estimate the line-of-sight magnetic field strength B.}, publisher={Joint Science Operations Center (JSOC), Stanford University}, author={The HMI Consortium: Stanford University (USA) and NASA Goddard Space Flight Center (USA) and Lockheed Martin Solar and Astrophysics Laboratory (USA) and National Center for Atmospheric Research (USA)}, year={2024} }