"differ"

Title:		LONG DURATION VERY SOFT X-RAY FLARES
Authors:		M. Siarkowski , S. Gburek and P. Rudawy
Abstract:		Using RF15-I X-ray photometer aboard INTERBALL-Tail satellite we have identified a class of very soft, low intensity and long duration flares. They have decay time of the order of hours, low GOES class (~A or ~B) and usually no detectable emission above 10 keV. We used YOHKOH Soft X-ray Telescope images to search for sources of these events. We have found that, similarly to bigger flares, there is a large diversity in the morphology of these small events, including arcades of loops, interacting loop systems, and in one case a sigmoid. Many of these sources are observed at the limb and they may be a part of the larger structures hidden behind the solar disk. In this paper we present morphology and investigate physical parameters of three selected events.