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> the galactic synchrotron

"The plane of the Milky Way is dominated by diffuse radio emission with a brightness temperature of thousands of Kelvin at low radio frequencies (Zheng et al. 2016). This emission originates from relativistic electrons interacting with the Galactic magnetic field."

https://uhra.herts.ac.uk/bitstream/handle/2299/17665/stw2959...

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Question: Why the galactic synchrotron and not, say, the solar synchrotron? I'm assuming the latter exists but is negligible for some reason? Why is that?

Apparently the particles need to be relativistic, maybe the Sun doesn't generate enough acceleration compared to the central galactic supermassive black hole?

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