Emergence of sheared magnetic flux tubes in an active region observed with the SVST and TRACE |
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| Authors: | Deng Y.Y. Schmieder B. Engvold O. DeLuca E. Golub L. |
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| Affiliation: | (1) Beijing Astronomical Observatory, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, China;(2) Section de Meudon, Observatoire de Paris, 92195 Meudon Principal Cedex, France;(3) Institute of Astrophysics, University of Oslo, Blindern, Norway;(4) Smithsonian Astrophysical Observatory, 60 Garden Street MS 58, Cambridge, MA , 02138, U.S.A. |
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| Abstract: | The active region NOAA AR 8331 was a target of an international ground-based observational campaign in the Canaries and coordinated with space instruments (TRACE and Yohkoh). We focus our study on observations obtained with the SVST at LaPalma, and with TRACE. On 10 September 1998, arch-filament systems were observed with high spatial and temporal resolution, from the lower to the upper atmosphere of the Sun, during five hours. Flux tubes emerged with increasing shear, which apparently led to energy release and heating in the overlying corona. A model for filament formation by the emergence of U-shaped loops from the subphotosphere, as proposed by Rust and Kumar (1994), is supported by the present observations. The coronal response to these events is visualized by rising, medium-scale loop brightenings. The low-lying X-ray loops show short-lived, bright knots which are thought to result from interaction between different loop systems. |
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