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A catalogue of X-ray Plasma Ejections (XPEs) observed by the Soft X-rayTelescope onboard the YOHKOH satellite has been recently developed in theAstronomical Institute of the University of Wroc{\l}aw. The catalogue containsrecords of 368 events observed in years 1991-2001 including movies andcrossreferences to associated events like flares and Coronal Mass Ejections(CMEs). 163 XPEs from 368 in the catalogue were not reported until now. A newclassification scheme of XPEs is proposed in which morphology, kinematics, andrecurrence are considered. The relation between individual subclasses of XPEsand the associated events was investigated. The results confirm that XPEs arestrongly inhomogeneous, responding to different processes that occur in thesolar corona. A subclass of erupting loop-like XPEs is a promising candidate tobe a high-temperature precursor of CMEs.

A Catalogue of Solar X-ray Plasma Ejections observed by the Soft X-ray Telescope onboard YOHKOH