Amplitude of solar wind density turbulence from 10--45 $R_{\odot }$

Abstract

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 $45R_{\odot }$. 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.

Accepted for publication in the J. Geophysical Research

References in corpus (4)

• Radial Dependence of the Frequency Break Between Fluid and Kinetic Scales in the Solar Wind Fluctuations
• The structure of solar radio noise storms
• Coronal turbulence and the angular broadening of radio sources - the role of the structure function
• A study of density modulation index in the inner heliospheric solar wind during solar cycle 23

Cited by in corpus (8)

• An Anisotropic Density Turbulence Model from the Sun to 1 au Derived From Radio Observations
• Turbulent Proton Heating Rate in the Solar Wind from $5$ to $45R_{\odot }$
• Turbulent density fluctuations and proton heating rate in the solar wind from 9-20~R_{\odot}
• LOFAR observations of radio burst source sizes and scattering in the solar corona
• New results on the direct observations of thermal radio emission from a solar coronal mass ejection
• Dissipation scale lengths of density turbulence in the inner solar wind
• Low frequency radio observations of the `quiet' corona during the descending phase of sunspot cycle 24
• Observations of shock propagation through turbulent plasma in the solar corona