Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-12-09
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
12 pages, 4 figures. Solar Physics, submitted
Scientific paper
This paper presents results of comparison between observations of coronal holes in the UV (SOHO EIT) and microwave emission (17, 5.7 GHz, 327 and 150.9 MHz, NoRH, SSRT and Nancy radioheliographs), and solar wind parameters, according to the ACE spacecraft data over the period 12 March--31 May 2007. Increase in the solar wind velocity up to ~600 km/s was found to correlate with decrease in the UV flux in the central parts of the solar disk. The connection between parameters of the microwave emission at three different solar atmosphere levels and the solar wind velocity near the Earth's orbit was determined. This connection suggests existence of common mechanisms of solar wind acceleration from chromospheric altitudes to the upper corona. We also suppose existence of two different mechanisms of the solar wind acceleration at altitudes of less and more than one solar radius.
Myagkova Irina
Prosovetsky Dmitry
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