IGRF Magnetic Field

Version 1.2.0.0 (1010 KB) by Charles Rino
Compute IGRF mean earth magnetic field
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Updated 4 Oct 2010

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MATLAB implementation of IGRF11 fortran code as function for calculating Earth mean magnetic field. Implementation has been modified to default to GPS reference coordinates with output B components North, East, and Vertical. Spherical harmonic coefficients are derived from downloaded Excel file.
http://www.ngdc.noaa.gov/IAGA/vmod/igrf.html

Screenshot created by Demo_igrf11syn

Cite As

Charles Rino (2026). IGRF Magnetic Field (https://uk.mathworks.com/matlabcentral/fileexchange/28874-igrf-magnetic-field), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2010b
Compatible with any release
Platform Compatibility
Windows macOS Linux
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IGRF/

Version Published Release Notes
1.2.0.0

date fdate variable conflict fixed.
1.1.0.0

Error noted by Mark Shore for fyear>=2000 fixed. GHcoefficients.mat version of spherical harmonic coefficients added. Code checked against results kindly provided by Mark Shore.
1.0.0.0