National Geophysical Data Center (NGDC), NOAA Satellite and Information Service IGRF Maps

IAGA image spreadsheet application to display and download IGRF magnetic field maps and data from 1900 - 2020.
The application allows the user to select the number of rows (years) and columns (magnetic elements) to display.
Each "cell" of the this application displays the appropriate map for the selected year and element as well as links
to the PDF for a higher resolution version of the map and to the data used to create the map.