DIMMING EVENT ASSOCIATED WITH SUDDEN DISAPPEARANCE OF A FILAMENT

qs105.hiei10
Posted:  16-Dec-96
Updated:
Events specified: filament disappearance on 16-Jan-93

Eijiro HIEI, Meisei University, Tokyo, 191 , Japan Art HUNDHAUSEN,HAO/NCAR, Boulder, Colorado Joan BURKEPILE,HAO/NCAR, Boulder, Colorado

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fl233.hudson16 Coronal Dimming and CME's

A sudden disappearance of a filament was observed at around S48 E01 in a quiet region on 16 January 1993. Soft X-ray images, taken with the Yohkoh SXT instrument, and H-alpha images on four successive days of 13-16 January show that coronal loop structure ,seen in soft X-ray images above the dark filament, has been slowly swollen and drastically changed just before the disappearance of the filament. Two dimming regions appeared at the same place as the disappearance. Brightening of soft X-ray region then appeared at that place. The swollen phenomenon was observed before coronal mass ejection (Hundhausen 1993), and the 16 January 1993 event seems to be associated with a coronal mass ejection. The dimming,which would be due to depletion of the coronal material, is thought to be the signature of a mass ejection event seen on the disk.