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.

arXiv commentAccepted for publication in the J. Geophysical Research

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• Global Solar Magnetic-field and Interplanetary Scintillations During the Past Four Solar Cycles
• 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
• Dissipation scale lengths of density turbulence in the inner solar wind
• New results on the direct observations of thermal radio emission from a solar coronal mass ejection
• Low frequency radio observations of the `quiet' corona during the descending phase of sunspot cycle 24
• Dynamics of solar Coronal Mass Ejections: forces that impact their propagation
• Observations of shock propagation through turbulent plasma in the solar corona