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Context: The Yohkoh/HXT observations of Long Duration Events (LDEs) showedthat the HXR emission (14-23 keV) is present for tens of minutes after flaremaximum. Hence, some heating process is expected to exist during that time. Thebetter energy resolution of RHESSI compared to HXT allow us to analyse LDEs inmore comprehensive way.  Aims: We selected three LDEs observed by RHESSI to answer the questions howlong HXR emission can be present, where it is emitted, what is its nature andhow much energy should be released to sustain the emission.  Methods: We used RHESSI data to reconstruct images of the selected flareswith an energy resolution as good as 1 keV. Next we estimated physicalparameters of HXR sources through imaging spectroscopy. The physical parametersobtained were then used to calculate the energy balance of the observedsources.  Results: We found that HXR thermal emission can be present for many hoursafter LDE flare maximum. The emission comes from large and hot loop-topsources. The total energy that must be released to sustain the emission of thesources is as high as 10^31 erg.

RHESSI Observations of Long-Duration Flares With Long-Lasting X-ray Loop-Top Sources