The formations and eruptions of a filament

Zhou Guiping, gpzhou@nao.cas.cn, Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences
Tsuneta S., National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan
Wang Jingxiu, wangjx@nao.cas.cn, Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences

Abstract
A continuous observations near an small active region (AR) NOAA 10976 by the Solar Optical Telescope (SOT) and X-Ray Telescope (XRT) on board the Hinode satellite during Dec. 02 2007 from 15:50 UT to 19:59 UT. A filament was observed to appear and fade away three times on an polarity inversion line (PIL) that very close to the AR 10976. The SOT instrument provides us with the time series of Halpha observation and vector magnetic fields on the photosphere under the prominence. In X-Ray and EUV observations, a helical coronal loop structures is located above the filament. The time of filament formation is consistent with the cooling time of coronal material. The formations and eruptions of the filament are observed to be associated with the untwisting and expanding of the X-ray loop structures above. It is suggested that the filament structure has close relationship with the helical coronal loops.