Astronomy and Astrophysics – Astronomy
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004astl...30..343l&link_type=abstract
Astronomy Letters, vol. 30, p. 343-348 (2004)
Astronomy and Astrophysics
Astronomy
3
Scientific paper
In experiments that were regularly carried out in 1999-2002 with Pushchino radio telescopes (Russian Academy of Sciences), the study of the radial dependence of the scattering of radio emission from compact natural sources was extended to regions of circumsolar plasma farther from the Sun. Based on a large body of data, we show that, apart from the standard transonic acceleration region located at distances of 10-40 Rsolar from the Sun, there is a region of repeated acceleration at distances of 34-60 Rsolar attributable to the equality between the solar wind velocity and the Alfvenic velocity. The repetition in the trans-Alfvenic region of the characteristic features of the radial stream structure observed in the transonic region (the existence of a precursor, a narrow region of reduced scattering that precedes a wide region of enhanced scattering) suggests that the main characteristic features of the resonant acceleration of solar wind streams are preserved up to distances of the order of 60 Rsolar.
Lotova N. A.
Obridko Vladimir N.
Subaev I. A.
Vladimirskii K. V.
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