The Chiralities of Three Filaments in AR7500

An analysis of structure and evolution of three filaments in AR7500 ON May, 1993 is presented.The three filaments show the following remarkable peculiarities:1)a sinistral filament lies between two dextral filaments and meets them at two cusps.One of the cusps is rooted in positive polarity plage region while the other in a small decaying spot with negative polarity.2)Both chromospheric plaget te-associated fibrils near the filaments and the transverse mag netic fields of the photosphere beneath the filaments almost parallel to the long axis of these filaments, suggesting the dominance of axial field of filaments;the spots near filament's ends, however, do not show clearly counterclockwise or clockwise superpenumbral fibril pattern.3)The three filaments do not merge into a single filament during 8-day observation.This can be explained by considering that the magnetic fields along their long axes are in different directions at two cusps.When one of dextral filaments and the sinistral filarment eventually dissipate into fibrils connecting the opposite polarity regions, their jointing cusps can be still clearly observed due to their opposite chiralities.