The energy balance in the solar wind formation region

1. The energy balance in the solar wind formation region S.I.Molodykh Institute of Solar-Terrestrial Physics SB PAS, 664033, Russia,Irkutsk,p/b 4026, Email: sim@iszf.irk.ru

2. The main topics To carry out the analysis of energetic balanse of solar wind in formation region on the basis of observation data: • Dependence of electron density, nonthermal velocity and temperature from heliolatitude at heliocentric distance 1.02Ro; • Dependence of electron density from heliocentric distance in two regions of the solar corona with an essentially different flow geometry (in quiet region and coronal hole).

10. Conclusion • It is shown that the energy flux, required for solar wind formation, enters the solar corona in the form of Alfven waves whose dissipation provides the heating of the solar wind plasma near the Sun.Their transformation to acoustic waves in this region is less effective than the dissipation. • With distance from the Sun the dissipation of the Alfven waves falls off, and the heating of the solar wind plasma is determined by the coefficient of Alfven wave transformation to acoustic waves. • Subsequently, the dissipation effectiveness of the acoustic waves decreases, and as soon as the absorption coefficient of acoustic waves becomes less than the transformation coefficient of the Alfven waves to acoustic waves, plasma heating is now determined by the absorption coefficient of acoustic waves.