DETERMINATION OF ORIGIN OF NASA STRATOSPHERIC PARTICLES

Paper presents a reanalysis of four stratospheric particles registered in the Cosmic Dust Catalogs (CDC). Two particles have been classifed in the NASA Johnson Space Centre (JSC) in Houston as natural, terrestr ial contaminants and the origin of the other two particles was found q uestionable, probably cosmic. Present study has confirmed these conclu sions; however some new additional features in the chemical analysis h ave been found which can finally determine the classification of the p articles with unclear origin.