Alternate Views: Get Data, FAQ, ISO Rubric, CSW, HTML, Components, XML International Geomagnetic Reference Field - 11th Generation The eleventh generation of the International Geomagnetic Reference Field (IGRF) was adopted in December 2009 by the International Association of Geomagnetism and Aeronomy Working Group V-MOD. It updates the previous IGRF generation with a definitive main field model for epoch 2005.0, a main field model for epoch 2010.0, and a linear predictive secular variation meodel for 2010.0-2015.0. Get the Data Access Format(s) Distributor(s) / Contact Info Instructions / Constraints download Geomag 7.0 for Windows Geomag-7 contains coefficent files and the software to manipulate it on a Windows machine. download Geomag 7.0 for Linux Geomag-7 contains coefficent files and the software to manipulate it on a Linux machine. download IGRF-11 Fortran Source Code Fortran program with IGRF-11 coefficients integrated into the source code. download IGRF-11 Coeffiecients as Text Text format of the IGRF-11 coefficients. download IGRF-11 Coeffiecients as Excel Spreadsheet Excel spreadsheet format of the IGRF-11 coefficients. Geomag 7.0 for Windows Format version: 7 Format specification: Geomag-7 contains coefficent files and the software to manipulate it on a Windows machine. Geomag 7.0 for Linux Format version: 7 Format specification: Geomag-7 contains coefficent files and the software to manipulate it on a Linux machine. IGRF-11 Fortran Source Code Format version: 1 Format specification: Fortran program with IGRF-11 coefficients integrated into the source code. IGRF-11 Coeffiecients as Text Format version: 1 Format specification: Text format of the IGRF-11 coefficients. IGRF-11 Coeffiecients as Excel Spreadsheet Format version: 1 Format specification: Excel spreadsheet format of the IGRF-11 coefficients. Fees None Legal Constraints