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/Vector_Magnetic_Field/PT720S NASA NumericalData SDO/HMI Vector Magnetic Field https://doi.org/10.48322/qa09-xp16 2026-07-21T12:07:12Z 2024-11-01T00:08:46Z Metadata created by SY 2024-11-18T00:08:46Z Added DOI by SY 2025-09-18T11:27:09Z 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 2025-09-30T14:25:19Z Updated PublishedBy name to match ROR Registry. ZCB 2025-12-04T13:31:27Z Added MetadataRightsList. Updated to 2.7.1. ZCB 2026-06-26T13:27:58Z Add 'Z' to RevisionEvent:ReleaseDate(s), PublicationDate, TemporalDescription:TimeSpan:StartDate. ZCB 2026-07-21T12:07:12Z Added HelioData InformationURL. JWL The vector magnetic field is derived from full-disk filtergrams collected in a 135-second sequence. (90 seconds after 13 April 2016). The observations are obtained in polarized light at several wavelengths across a spectral line. The filtergrams are calibrated and registered to account for solar rotation before being combined to provide Stokes polarization parameters. The parameters are used to determine the magnetic and other plasma parameters using VFISV, a Milne-Eddington inversion code. The final step is to disambiguate the data, that is to infer the azimuthal direction of the transverse field. 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) 2011-01-21T00:00:00Z 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 HelioData https://helio.data.nasa.gov/dataset/SDO_HMI_Vector_Magnetic_Field_PT720S The HelioData dataset page provides an overview of the dataset with access links, associated variables, and more. spase://SMWG/Repository/Stanford/HMI-AIA.JSOC Online Open JSOC Data Center http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.B_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 Magnetogram 2010-05-01T00:00:00Z -P3D PT720S Sun Sun.Photosphere FITS Data Array Vector magnetic field strength PT720S gauss Vector Magnetic Cartesian HPC Array size: 4096x4096 Pixel Resolution: 0.504 arcsec