# Custom Magnetic Vector Potential

**URL:** <https://community.geodynamics.org/t/custom-magnetic-vector-potential/1484>\
**Category:** Rayleigh\
**Created:** [October 1, 2020, 5:35pm UTC](https://community.geodynamics.org/t/custom-magnetic-vector-potential/1484 "2020-10-01T17:35:30Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Katzaman](https://avatars.discourse-cdn.com/v4/letter/k/a587f6/32.png) [@Katzaman](https://community.geodynamics.org/u/Katzaman)\
**Post date:** [October 1, 2020, 5:35pm UTC](https://community.geodynamics.org/t/custom-magnetic-vector-potential/1484/1 "2020-10-01T17:35:30Z")

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Hi,

I am a PhD student at Liberty University using Rayleigh for my PhD research. I am looking for a way to define a custom magnetic vector potential within the main\_input file. Is that possible or will I need to dig into the code further to find what I need? I see options to use a random field but I want to have one user-defined.

Thank you,  
Eric Katzaman