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We have resolved the scatter-broadened image of PSR B0329+54 and detectedsubstructure within it. These results are not influenced by any extendedstructure of a source but instead are directly attributed to the interstellarmedium. We obtained these results at 324 MHz with the ground-spaceinterferometer RadioAstron which included the space radio telescope (SRT),ground-based Westerbork Synthesis Radio Telescope and 64-m Kalyazin RadioTelescope on baseline projections up to 330,000 km in 2013 November 22 and 2014January 1 to 2. At short 15,000 to 35,000 km ground-space baseline projectionsthe visibility amplitude decreases with baseline length providing a directmeasurement of the size of the scattering disk of 4.8$\pm$0.8 mas. At longerbaselines no visibility detections from the scattering disk would be expected.However, significant detections were obtained with visibility amplitudes of 3to 5% of the maximum scattered around a mean and approximately constant up to330,000 km. These visibilities reflect substructure from scattering in theinterstellar medium and offer a new probe of ionized interstellar material. Thesize of the diffraction spot near Earth is 17,000$\pm$3,000 km. With theassumption of turbulent irregularities in the plasma of the interstellarmedium, we estimate that the effective scattering screen is located 0.6$\pm$0.1of the distance from Earth toward the pulsar.

PSR B0329+54: Substructure in the scatter-broadened image discovered with RadioAstron on baselines up to 330,000 km