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Measurement of the propagation speed of plasma inhomogeneities in the solar corona using an uplink/downlink cross-correlation method

Pätzold, Martin; Bird, Michael K.; Plettemeier, Dirk +3 more

Radio sounding investigations were performed over a period of about 30 days during the 1991 solar occultation of the Ulysses spacecraft (August and September 1991). Dual-frequency Doppler and ranging measurements were obtained using the NASA Deep Space Network. For this experiment the radio ray path from Ulysses to Earth moved essentially parallel…

An explanation for the absence of sounder-stimulated gyroharmonic resonances in the Io plasma torus by the Ulysses relaxation sounder

Stone, R. G.; Fainberg, J.; Benson, R. F. +2 more

Plasma resonances were excited by the relaxation-sounder component of the unified radio and plasma wave instrument (URAP) during the Ulysses encounter with Jupiter's Io plasma torus. The observed resonant spectra were quite different than expected, based on earlier published observations from topside sounders in the terrestrial ionosphere and rela…