Double-lens scintillometry: the variable scintillation of pulsar B1508 + 55

ABSTRACT We report on observations of PSR B1508 + 55’s scintillation at the Effelsberg 100-m telescope spanning from early 2020 to 2022. In autumn 2020, close time pulsar was predicted cross echoes in its pulse profile, a sudden transition arcs peculiar stripe-like features parabolic arclets observed. To infer geometric model scattering, we measure effects annual velocity curve Earth, relative movement line sight, and projection points second scattering screen develop novel methods do so. The latter phenomenon discovered by this study strongly indicates two-screen geometry. derive an analytical demonstrate Markov chain Monte Carlo analysis as well simulations that it can be successfully applied explain interpreting change amplitudes images shift orientation anisotropy. collection methods, here is transferable other pulsars with potential improve constraints models.