The filament is composed of cold plasma suspended in the solar atmosphere, which is shown as a dark absorption structure. Its magnetic field information plays a vital role in understanding the formation, stability and explosion of the filament. Recently, the site selection and coronal observation group of the Yunnan Observatory of the Chinese Academy of Sciences obtained new observation results in the study of large-amplitude filament oscillation, and the relevant results were published in the Monthly Journal of the Royal Astronomical Society. When the filament is disturbed and subjected to magnetic tension, the filament material will move back and forth in the line of sight of the observation equipment. With the help of the movement of the bidirectional jet in the magnetic rope structure of "filament coronal cavity", the research team has made a preliminary exploration of the interaction between the jet and the filament. On this basis, they turned their attention to the large-amplitude filament oscillation triggered by the bidirectional jet, and analyzed the nature of this large-amplitude oscillation in detail. Researchers analyzed the oscillation of a quiet filament on November 29, 2011, and found that the bidirectional jet generated at the southern foot of the filament first moved northward along the magnetic field line that forms the coronal cavity, and then pushed part of the filament material to rise and fall back, and began to oscillate longitudinally at the bottom of the coronal cavity. At the same time, the northern part of the filament also began to oscillate laterally. With the help of the method of prominence seismology, the radius of curvature at the bottom of the magnetic depression can be obtained to be about 151 megameters, which is consistent with the result of three-dimensional reconstruction of the magnetic depression directly "seen". Researchers believe that the newly formed jet can not only trigger the longitudinal and lateral oscillation of a single filament, but also become a seismological tool for diagnosing filament information. This work is the first time to observe the simultaneous longitudinal and transverse oscillations of a filament, which enriches the observation results of filament oscillation research and lays the foundation for further research. (Xinhua News Agency)
Edit：He Chuanning Responsible editor：Su Suiyue
Source：Sci-Tech Daily
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