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Critical point of the solar wind by radio sounding dataResults 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.
Document ID
19960021353
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
Authors
Lotova, N. A.
(Academy of Sciences (USSR) Troitsk, USSR)
Oraevsky, V. N.
(Academy of Sciences (USSR) Troitsk, USSR)
Pisarenko, Ya. V.
(Academy of Sciences (USSR) Troitsk, USSR)
Vladimirskii, K. V.
(Academy of Sciences (USSR) Moscow, USSR)
Date Acquired
August 17, 2013
Publication Date
June 30, 1995
Subject Category
Solar Physics
Accession Number
96N24749
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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