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IGRF Magnetic Field

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IGRF Magnetic Field

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28 Sep 2010 (Updated )

Compute IGRF mean earth magnetic field

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Description

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

Acknowledgements

This file inspired International Geomagnetic Reference Field (Igrf) Model.

MATLAB release MATLAB 7.11 (R2010b)
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Comments and Ratings (4)
02 Feb 2012 Brian

This is straight forward and easy to use.

05 Oct 2010 Mark Shore

Documentation has been improved and the function now returns proper values for the current epoch. A useful IGRF tool for MATLAB users that can be used for individual points or for global grids. No limit checking on lat/lon values; users will need to check their own inputs.

30 Sep 2010 Joaquim Luis

You may want to look at this too.
It's very fast (MEX) and point-and-click driven

http://sites.google.com/site/mironehowtos/geophysics/display-the-earth-magnetic-field

28 Sep 2010 Mark Shore

File is insufficiently documented (for example, the spherical coefficients have to be loaded before the main program can run) and post 2009 results differ significantly from those calculated by other software implementations of IGRF.

Updates
03 Oct 2010

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.

04 Oct 2010

date fdate variable conflict fixed.

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