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XUV-DIAGNOSTICS and MODELING OF ACTIVE PLASMA STRUCTURES OBSERVED IN THE SPIRIT EXPERIMENT ON THE ORBITAL STATION CORONAS-F
A.Urnov, S.Kuzin, S.Bogachev, F.Goryaev, S.Shestov
abstract: In the present paper a short overview is given for the main methods and results of modeling for some plasma structures in the solar corona, observed in the experiment SPIRIT by means of the spectroheliograph RES. This device, being unique in the world practice, made it possible to measure simultaneously about 150 full-Sun monochromatic images in EUV lines in the region 175 - 205 and 280 - 330 A, as well as in the X-ray line of the Mg XII line at 8.42 A. For the period since the launch of the satellite, 31 July 2001, more than 300 thousands of spectroheliograms have been registered with high temporal resolution by the RES device. These spectroheliograms provided a basis for creation of a unique data bank which made it possible to study the characteristics of both - known plasma structures in the solar corona (active regions, coronal holes) as well as new type of transients, firstly observed in the X-ray monochromatic images: so called 'spiders' hot clouds and other dynamical phenomena with life-time from minutes up to days. EUV spectra have been used for the determination of the distributions for the electron density and the differential emission measure (DEM) with the temperature for various plasma structures, observed in the X-ray channel of RES: active regions, flares and 'spiders'. The comparison of the temporal profiles of full-Sun fluxes from X-ray channel of RES with GOES and YOHKOH/SXT data made it possible to determine temperature distribution of different plasma structures versus time and space. The results of modeling of physical conditions in the emitting plasma were used for the analysis of the mechanisms of formation and dynamics of plasma structures, discovered in the X-ray full-Sun monochromatic images.
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