Critical point of the solar wind by radio sounding data

Details Critical point of the solar wind by radio sounding data Critical point of the solar wind by radio sounding data

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.confr..61l&link_type=abstract

Academy of Sciences (USSR), International Solar Wind 8 Conference, p. 61

Computer Science

Sound

Atmospheric Sounding, Critical Point, Solar Wind, Transonic Flow, Scintillation, Interplanetary Space, Solar Wind Velocity, Velocity Distribution, Space Plasmas, Water Vapor, Water Masers, Electron Scattering, Wind Measurement, Magnetohydrodynamic Waves, Telescopes

Scientific paper

Results of the close-to-Sun plasmas sounding at the transonic region of the solar wind, where the sub-to supersonic flow transition proceeds (at 10 to 40 solar radii from the Sun), are presented. Natural sources of two types were used, water vapour maser sources at 1.35 cm and guasars at 2.9 m wavelength. scattering observations cover the period of 1986 to 1993, Russian Academy of Sciences telescopes RT-22 and DCR-1000 were used, IPS index and scattering angle being the immediate results of observations. Extensive studies of the scintillation index and scattering angle radial profiles reveal a remarkable structural detail, 'transonic region forrunner'-narrow region of diminished scattering close to the internal border of the extended transonic region with its characteristic enhanced scattering. Comparisons of the scattering and plasma velocity profiles let it possible to determine the critical point positions by the comparatively simple scattering observations. This new possibility widely improves the process of the basic data accumulation in the fundamental problem of the solar wind acceleration mechanism.

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