Abstract
A large volume of coronal radio sounding has been accumulated over the years 1991–2009 by the ULYSSES, MARS-EXPRESS, and ROSETTA spacecraft. A description of the dual-frequency radio sounding investigations of the circumsolar plasma and the methods for processing of the signal frequency fluctuations are presented. It is demonstrated that a quasi-periodic sporadic component with a period of 3–8 min is present in the radio frequency fluctuation temporal spectra. The characteristics of the quasi-periodic oscillations are studied for various heliolatitudes and distances from the Sun. Wavelet analysis is applied to two radio tracking sessions in order to assess its effectivity in the detection and analysis of waves at specific periods. It is argued that the quasi-periodic component in the frequency perturbations is most probably caused by fast magnetoacoustic waves generated locally via nonlinear interactions with propagating coronal Alfven waves.
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