The Dynamical Feature of Filaments in AR7500

An analysis of the evolution and dynamical feature of three filaments using the magnetogram of photosphere and Hβ Dopplergrams of chromosphere in AR7500 on May, 1993 is presented in this paper. Conclusions are as follows:1)There are two dextral and a sinistral in three filaments. They constitude two cusps. One of the cusp is rooted in positive polarity plage region, which has blueshift motion and velocity cusp. While the other in a small decaying spot with negitive polority has redshift motion. The both ends in other side extend into the big negative polarity sunspot and positive polarity plage region respectively. The red and blue-shift motions of these cusps and both ends exist 24 hours continually.2)Both chromospheric plage associated fibrils near the filament and the transverse magnetic field of the photosphere beneath the filaments almost parallel to the long axis of these filaments. The sunspot of the end does not present obvious spiral structure. The orientations of the field along with the axis are different in these three filaments, and the possible direction of the flow of the electric current is identical. There are matter motion along the direction of the axis of magnetic field in two filaments, but this has no relationship with the difference of the handedness;it has symmetrical fall motion in the axis direction at the other dextral filaments of trouble activation.3)The axis field has different direction in cusp so that it does not always occur with merge of filament, as a dextral filament disappears and forms again. When two sinistral and dextral filaments disintegrate into parallel fibrils which connect the same positive or negative polarity, their cusps clearly exist due to the different handedness.4). The sinistral filament exists during several days, but no trouble activation in the two observing days. A dextral filament has trouble activation and “relaxing” turning round before disappearance. The other dextral filament exists for a long term presenting obvious trouble activation within the two days.