  We report on the amplitude of the density turbulence spectrum ($C_{N}^{2}$)
and the density modulation index ($\delta N/N$) in the solar wind between $10$
and $45 R_{\odot}$. We derive these quantities using a structure function that
is observationally constrained by occultation observations of the Crab nebula
made in 2011 and 2013 and similar observations published earlier. We use the
most general form of the structure function, together with currently used
prescriptions for the inner/dissipation scale of the turbulence spectrum. Our
work yields a comprehensive picture of a) the manner in which $C_{N}^{2}$ and
$\delta N/N$ vary with heliocentric distance in the solar wind and b) of the
solar cycle dependence of these quantities.
