FLUX EMERGENCE FROM THE SOLAR INTERIOR INTOA UNIFORMLY MAGNETIZED CORONA

摘要

We have carried out numerical experiments of the emergencernof magnetic flux from the solar interior into therncorona for the case when the latter has a preexisting,rnlarge-scale magnetic field. The emergence into the lowerrnatmosphere basically follows the same patterns as whenrnthe corona is unmagnetized. Yet, upon contact of the upcomingrnmagnetized plasma with the corona, the followingrnprocesses are observed to take place: formation ofrna concentrated, arch-shaped current sheet; reconnectionrnbetween the field lines of the corona and of the upcomingrnplasma system; heating to high temperatures in the reconnectionrnsites; launching of high-velocity outflows. Thosernfeatures have been described in a recent paper (Galsgaardrnet al, 2004), including the (crucial) dependence on thernmutual orientation of the magnetic field in the two systems.rnThe present contribution provides complementaryrnillustration of various aspects of the problem.