2.3.0 spase://SMWG/Service/CCMC/IGRF/Models International Geomagnetic Reference Field model 2019-04-19T12:34:56.789Z International Geomagnetic Reference Field (IGRF) empirical model spase://SMWG/Person/Susan.Macmillan GeneralContact About the IGRF https://ccmc.gsfc.nasa.gov/modelweb/ionos/iri.html spase://VSPO/Service/P_IGRF_HDR spase://VSPO/Service/IGRF/Models Access to files at the Community Coordinated Modeling Center https://ccmc.gsfc.nasa.gov/pub/modelweb/geomagnetic/igrf/fortran_code/