Large-Scale Disturbances of the Solar Wind According to Spacecraft Radio Transmission Data from the Mars Express and Local Measurements on the Wind Spacecraft

Abstract

The results of experiments on radio sounding of near the Sun plasma by the signals of the MarsExpress Mars satellite are presented. In the region of heliocentric distances of the proximate point of the lineof sight of 8–13 solar radii, frequency fluctuations of transmission radio signals were measured. During theexperiments sharp increases in the variance of frequency fluctuations were recorded on both the eastern andwestern limbs. In measurements near the Earth’s orbit on the Wind spacecraft in adjacent periods with a delayof 5–17 days, increases in the proton concentration and magnetic field strength were recorded at 7–15 times thebackground values. A comparison between the data related to the inner and near-Earth solar wind indicates thatthe observed disturbances are associated with the same region of the solar corona rotating with the Sun