Abstract:
We obtain scatter-broadened images of the Crab Nebula at 80 MHz as it transits through the inner solar wind
in 2017 and 2016 June. These images are anisotropic, with the major axis oriented perpendicular to the
radially outward coronal magnetic
fi
eld. Using these data, we deduce that the density modulation index
(
NN
ee
d
)
caused by turbulent density
fl
uctuations in the solar wind ranges from
1.9 10
3
́
-
to
7
.7 10
3
́
-
between 9 and 20
R
e
.Wealso
fi
nd that the heating rate of solar wind protons at these distances ranges
from
2
.2 10
13
́
-
to
1.0 10 erg cm s
11
3 1
́
---
. On two occasions, the line of s
ight intercepted a coronal
streamer. We
fi
nd that the presence of the streamer approximately doubles the thickness of the scattering
screen.
