What mechanism is responsible for the distinctive, broad-spectrum radio emission from SNRs?

Answer

Synchrotron radiation

Radio emission arises when high-speed electrons spiral around magnetic field lines amplified by the shock front, generating synchrotron radiation, which is a non-thermal process.

What mechanism is responsible for the distinctive, broad-spectrum radio emission from SNRs?
astronomyradiationsupernovaastrophysicsremnantssupernovae