How to do MVA of magnetic field using IRF

[neetasha]

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Step 2: Describe your environment

• irfu-matlab branch (e.g. master, devel): devel
• Matlab version used (e.g. Matlab R2020b): R2022a
• Operating system (e.g. Windows 10, Mac OS X 10.15.6, Linux Ubuntu 20.04): Windows 10__

• A 64-bit installation of Matlab was used.

Step 3: Describe the problem

Dear IRF team,

I have a magnetic field dataset of FGM, MMS spacecraft.
I want to find the LMN coordinates in gse coordinates which are,
L=[0.26, 0.09, 0.96]; M=[0.33,-0.94,-0.01];N=[0.91,0.32,-0.28]
I used the IRF function given as below,
[out,l,v]=irf_minvar(Bgse)
The result it is showing is not similar to the result obtained in the paper,
universality of lower hybrid waves in earth's magnetosphere, Graham et.al.,2019.
It will be helpful if you give suggestions on it.

Thanks in Advance,
Neetasha

[danbgraham]

For the MVA coordinate system used in the paper, I think MVA was taken over the entire magnetopause crossing using the constraint = 0. Using the time interval 2016-11-28T07:29:40Z/2016-11-28T07:31:20Z yields a nearly identical coordinate system. I do not recall the exact times used to compute the coordinate system in the paper.