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Quasi-periodic frequency fluctuations observed during coronal radio sounding experiments 1991-2009

Pätzold, M.; Bird, M. K.; Efimov, A. I. +5 more

Coronal radio sounding experiments were carried out using the dual-frequency signals of the spacecraft Ulysses, Galileo, Mars Express, Venus Express, and Rosetta. The change in differential frequency recorded at the NASA and ESA ground stations, a quantity sensitive only to the plasma along the radio ray path from spacecraft to receiver, has been …