Analysis of Magnetic Fields and Hard X-ray on the Active Region NOAA 8088

FALEWICZ, R,; MANDRINI, C.H.; RUDAWY, P.; SIARKOWSKI, M.

Florencia

Congreso; Magnetic Fields and Solar Processes. The 9th European Meeting on Solar Physics; 1999

ESA

Exploring the X-ray and Ha observations of the C7.2 class solar fiare in NOAA 8088 on 25 September 1997 we have previously build a self-consistent 3D model of itsevolution and configuration of the magneticfields.At present we describeresults of the comprehensive 3-Dnumerical modelling of the magneticfields of the sameactive region. Taking into accountall limita­ tions of the numericalmodelling, we found two pos­ sible, different scenarios of the evolution and inter­ actions of the magneticfields during the fiare. We found that selection of the genuinenumerical model ofthe fiare was possible only using results of the analysis of the broad set of the variousobservational data. A problemof evaluation of the true model of theevent could be considered as very common.   Using X-ray data taken with INTERBALL-Tail satel­ lite we extended also our previousanalysis of the re­ lation between hard X-ray and microwaveemission during the flash phase of the fiare as well as temper­ atures during the early phase of the fiare.We find thatregistrated pulses of hard X-ray and 3 GHz mi­ crowave fluxes show tendencyto quasi-periodical rep­ etition . Assuming thermal emission we calculated the effective electron temperature with one secondtime resolution. The obtained values indicates that group of pre-maximum peaks of the fiare may be connected tonon-thermal heating phase (lasting approximately 2-3minutes) followed by thermal emissionphase with temperatures decreasing from 45 to 25 MK during next8 to 10 minutes.