Why might the surface brightness of ring particles and small moons orbiting Uranus and Neptune depend on whether those plants have expensive and strong magnetic field?

The surface brightness of ring particles and small moons around Uranus and Neptune may be influenced by their magnetic fields due to the interaction between charged particles in the magnetosphere and the surfaces of these bodies. Strong magnetic fields can trap more charged particles, leading to higher levels of radiation and potential alterations in surface materials, which can enhance or diminish brightness. Additionally, the presence of a magnetic field could influence the retention of volatiles and the processes of space weathering, affecting surface reflectivity. Thus, the dynamics of the magnetic environment can play a crucial role in determining the observed brightness of these celestial bodies.