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Re:Swarm satellites probe weakening of Earth’s magnetic field by JshWright on Thursday May 28, 2020 @10:31AM (#23337711)
I'm not the commenter you're repling to, but personally I think I originally learned about the SAA from a Scott Manley video.
Re:Swarm satellites probe weakening of Earth’s magnetic field by iso947 on Thursday May 28, 2020 @10:40AM (#23337841)
I suspect this one, explaining the various parts of mission control

https://youtu.be/6zFAme3SQAo