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We analyse the observational characteristics for a set of Long DurationEvents (LDE) using Reuven Ramaty High Energy Solar Spectroscopic Imager(RHESSI). Excellent energy resolution (1 keV) of HXR images reconstructed withRHESSI allowed us to perform imaging spectroscopy of coronal loop top sources(LTS) observed for hours after maximum of the flare. We found that the sourcesare large structures. The diameter of an LTS is changing with time and energy.High temperature component can be observed for few dozen hours after themaximum. For some time intervals clear non-thermal component was observed inspectra, but there was no significant footpoint emission at that time. Allthermal and non-thermal emissions originate from the LTS. The obtainedobservational characteristics were used in calculating the energy balancewithin LTS, which are presented in Kolomanski, 2011 (this issue).

RHESSI Investigation of X-Ray Coronal Sources During Decay Phase of Solar Flares: I. Observations