Abstract
Faraday rotation fluctuations (FRF) of S-band polarized radio signals observed during the 1981 solar conjunction of the Helios spacecraft are used to investigate Alfvén waves in the solar corona. The occultation geometry enabled coronal radio sounding of the heliographic equatorial region at solar offset distances from 3–12 R⊙. Spectral analysis was performed with the FRF data to determine the turbulence regime of the magnetic field irregularities. Cross-correlation functions of signals received simultaneously at two widelyseparated ground stations were used to obtain the propagation speed of Alfvén waves traversing the ray paths.
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