  We investigate the potential of the Square Kilometre Array (SKA) in detecting
synchrotron radiation emitted from the decay of sub-GeV dark matter (dark
matter with masses below the GeV scale) in the presence of strong magnetic
fields. As a concrete setup, we consider scenarios where the magnetosphere of a
magnetic white dwarf overlaps with dense dark matter environments, such as
those surrounding a primordial black hole. Our study reveals that the
encounters of compact objects such as white dwarfs and black holes offer a
promising avenue for upcoming radio telescopes to probe the properties of light
dark matter, which has been less explored compared with more conventional
heavier (masses above the GeV scale) dark matter.
