Radio maps of the solar wind transonic region

Astronomy and Astrophysics – Astronomy

Scientific paper

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Quasars, Radio Telescopes, Solar Wind, Astronomical Observatories, Space Plasmas, Solar Activity, Radio Astronomy, Magnetohydrodynamic Flow, Radio Waves, Spaceborne Experiments, Water Vapor, Wave Scattering

Scientific paper

Extensive radio astronomical exploration of near-solar plasmas was carried out in 1987-1993 at radial distances nowadays inaccessible for direct spacecraft experiments. Radio wave sounding experiments were carried out using two types of natural sources-water vapor masers at 1.35 cm and quasars at 2.9 m wavelength. Russian Academy of Sciences radio telescopes RT-22 and DCR-1000 were used. The results of daily observations formed the radial dependence of the radio wave scattering from whence structural peculiarities of the solar wind flow were derived. Simultaneous observations of several sources makes it possible to realize radio maps visualizing the plasma flow stream structure. The 1987 to 1993 maps allow to analyse the transonic region structural changes in relation to the 11-year cycle phase.

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