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We present the first measurement of pulse scattering close to the eclipseregion of PSR B1957+20, which is in a compact binary system with a low-massstar. We measured pulse scattering time-scales up to 0.2 ms close to theeclipse and showed that it scales with the dispersion measure (DM) excessroughly as $\tau\propto\Delta{\rm DM}^{2}$. Our observations provide the firstevidence of strong scattering due to multi-path propagation effects in theeclipsing material. We show that Kolmogorov turbulence in the eclipsingmaterial with an inner scale of $\sim100$ m and an outer scale of the size ofthe eclipse region can naturally explain the observation. Our results show thatthe eclipsing material in such systems can be highly turbulent and suggest thatscattering is one of the main eclipsing mechanisms at around 1.4 GHz.

Detection of strong scattering close to the eclipse region of PSR B1957+20