2.7.1 https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions spase://NASA/NumericalData/SDO/HMI/LOS_Dopplergram/PT720S NASA NumericalData SDO/HMI line-of-sight Dopplergram, 720-Second Data https://doi.org/10.48322/mn3e-wv09 2025-12-04T13:31:26Z 2024-11-01T00:08:46 Metadata created by SY 2024-11-18T00:08:46 Added DOI by SY 2025-09-18T11:27:08Z Added ResourceType and NamingAuthority. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. Matched version number in schemaLocation attribute to updated value in Version tag. ZCB 2025-09-30T14:25:18Z Updated PublishedBy name to match ROR Registry. ZCB 2025-12-04T13:31:26Z Added MetadataRightsList. Updated to 2.7.1. ZCB 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. 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) 2011-01-21T00:00:00 Stanford University spase://SMWG/Person/Philip.H.Scherrer PrincipalInvestigator spase://SMWG/Person/Rick.Bogart GeneralContact The HMI website at Stanford http://hmi.stanford.edu/ The SDO/HMI Instrument paper https://doi.org/10.1007/s11207-011-9834-2 spase://SMWG/Repository/Stanford/HMI-AIA.JSOC Online Open JSOC Data Center http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.V_720s[2020-01-01T00:00:00/60m] Change the date and the time to find the HMI data. SDO/HMI Data Search via Virtual Solar Observatory https://sdac.virtualsolar.org/cgi/search?time=1&instrument=HMI&spectrum=1&version=current&build=1 VSO path to JSOC-resident SDO HMI data files FITS spase://SMWG/Instrument/SDO/HMI Dopplergram 2010-04-24T19:11:26 -P3D PT720S Sun Sun.Photosphere FITS Data Array Line-of-sight velocity PT720S m/s Ion LineOfSight Velocity Cartesian HPC Array size: 4096x4096 Pixel Resolution: 0.504 arcsec