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Earth Magnetic Field with IGRF 13th Gen.

version 1.0.0 (5.72 KB) by Luigi De Maria
Earth Magnetic Field components using spherical harmonics, from order 1 to order 13,and IGRF 13th Gen. 2020 Gaussian coeff.s.

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Updated 05 Mar 2021

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The main code computes the Earth's Magnetic Field components (in Earth centered inertial frame) using spherical harmonics from order 1 until order 13.

The Gaussian Coefficients are taken from IGRF 13th Gen. 2020.

Cite As

Luigi De Maria (2021). Earth Magnetic Field with IGRF 13th Gen. (https://www.mathworks.com/matlabcentral/fileexchange/88406-earth-magnetic-field-with-igrf-13th-gen), MATLAB Central File Exchange. Retrieved .

Comments and Ratings (5)

Luigi De Maria

Thank you for the review Arthur! I have really appreciated your comparison!
I will investigate the nature of those differences and update the code as soon as I have some free time to dedicate.

Arthur Henry

I have made a comparison, the link should work now:
https://pasteboard.co/JUQ6MzUI.png

The function is similar but is not exactly right. I've use the correct gh coefficient interpolated at the right time, not the one provided in IGRF-13 as you only have year 2020 available.
The function is very efficient however:
IGRF-13-DeMaria ... 182.010 ms
IGRF-12-Matlab ... 34145.792 ms (igrfmagm)
IGRF-13-Compston ... 753.822 ms (gh vector pre-allocated)

This is the orbit I am using:
epoch: 7.3367e+05
i_deg: 97.4200
Omega_deg: 247.4627
e: 6.7030e-04
omega_deg: 130.5360
M_deg: 325.0288
a_km: 6821
n_deg_per_s: 0.0642

Initial datetime: 20-Sep-2008 11:01:18

Data generated using Matlab 2020a

Luigi De Maria

Yes I tested it during a project development. However I did not compared it with Matlab igrfmagm, I will do so in the next days. Thank you for the feedback!
P.S. The image you linked results as "not found"

Ash Dove-Jay

The function execution is really good, however the output doesn't match at all with igrfmagm matlab built-in function (Matlab 2020a). See image link below.
I don't have access to Matlab 2020b with 13th model at the moment, did you benchmark your code against igrfmagm?

https://pasteboard.co/JUfQ1Kq.png

Arthur Henry

MATLAB Release Compatibility
Created with R2019b
Compatible with any release
Platform Compatibility
Windows macOS Linux
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