Variations of the velocity field of the solar atmosphere according to observations SOHO/MDI and NSO/KPVT

Abstract

According to daily observation SOHO/MDI during 1996-2003 and NSO/KP Vacuum Telescope during 1978-2003 magnetic elements with intensity of the magnetic field above background have been allocated. The knots were then identified that allowed to trace their displacement comparatively of heliographic grid. Thus, fields of speeds for the period with 1978 on 2003 have been constructed. Variations of speed meridional circulation are found out. The basic direction of speed meridional drift is directed to poles. At the same time it is shown, that during a maximum of activity at latitude less than $20^o$ arise currents in the direction of equator. Streams in the direction to equator arise and during a minimum of activity at latitude about $40-60^o$. Fields of speeds on various phases of solar cycle are constructed.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html