Title:

MULTITEMPERATURE ANALYSIS OF SELECTED LIMB-OCCULTED FLARES

Authors:

B. Sylwester and J. Sylwester

Abstract:

The aim of this contribution was to compare the so-called " quasi" differential emission measure distributions (qDEM) with a "classical" DEM distributions. The qDEM distributions for the flaring region have been derived from the maps of "isothermal" temperatures and emission measures for the flaring region. The temperature and emission measure maps have been derived based on the deconvolved Yohkoh SXT images. The deconvolution has been performed in order to increase the spatial resolution. Next the images have been overlaid precisely using the position of the occulting solar disc as a reference. The high accuracy of coalignmet allowed to derive the temperature maps with spatial resolution down to ~1 arc-sec. From the other side the DEM distributions have been determined for a flare as a whole, based on integral flare fluxes measured by SXT and GOES using maximum likelihood iterative algorithm. In principle such a comparison of qDEM and DEM shapes should allow to investigate which part of DEM is related to the bright kernels observed on SXT images.

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