We obtain scatter-broadened images of the Crab nebula at 80 MHz as it transits through the inner solar wind in June 2016 and 2017 .
These images are anisotropic , with the major axis oriented perpendicular to the radially outward coronal magnetic field .
Using these data , we deduce that the density modulation index ( \delta N _ { e } / N _ { e } ) caused by turbulent density fluctuations in the solar wind ranges from 1.9 \times 10 ^ { -3 } to 7.7 \times 10 ^ { -3 } between 9 —- 20 R _ { \odot } .
We also find that the heating rate of solar wind protons at these distances ranges from 2.2 \times 10 ^ { -13 } to 1.0 \times 10 ^ { -11 } ~ { } erg~ { } cm ^ { -3 } ~ { } s ^ { -1 } .
On two occasions , the line of sight intercepted a coronal streamer .
We find that the presence of the streamer approximately doubles the thickness of the scattering screen .