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.
Similar content being viewed by others
References
Démoulin, P. and Priest, E. R.: 1997, Solar Phys. 162, 291.
Deng, Y. Y., Schmieder, B., Mandrini, C. H., Khan, J. I., Démoulin, P., and Rudawy, P.: 1999, Astron. Astrophys. 349, 927.
Georgakilas, A. A., Alissandrakis, C. E., and Zachariadis, T. G.: 1990, Solar Phys. 230, 200.
Golub, L. et al.: 1999, Phys. Plasmas 6, 2205.
Handy, B. N., Acton, L.W., Kankelborg, C. J., Wolfson, D. J., Bruner, M. E. et al.: 1999, Solar Phys. 187, 229.
Kurokawa, H., Kawai, G., Tsuneta, S., and Ogawara, Y.: 1994, in Y. Uchida et al. (eds.) X-ray Solar Physics from Yohkoh, Universal Academy Press, 59.
Mandrini, C., Deng, Y. Y., Schmieder, B., Démoulin, P., Rudawy, P., Nitta, N., Newmark, J., and deForest, C.: 1999, in Schmieder B., Hofmann A., and Staude J. (eds.), ASP Conf. series 184, 276.
Malherbe, J.M., Schmieder, B., Mein, P., Mein, N., van Driel, L., and von Uexkuell, M.: 1998, Solar Phys. 180, 265.
Mein, P., Démoulin, P., Mein, N., Engvold, O., Molowny-Horas, R., Heinzel, P., and Gontitakis, C.: 1996, Astron. Astrophys. 305, 343.
Molowny-Horas, R.: 1994, Astron. Astrophys. Suppl. 107, 121.
Rust, D. M. and Kumar, A.: 1994, Solar Phys. 155, 69.
Schmieder, B., Raadu, M. A., and Wiik, J. E.: 1991, Astron. Astrophys. 253, 353.
Schmieder, B., Mein, N., Mein, P., Malherbe, J. M., Wilken, V., Staiger, J., DeLuca, E., Engvold, O., and Hansen, I.: 1999, 9th European meeting, ESA SP 448, 653.
Schrijver, C. J., Title A. M., Berger T. E., Fletcher L. et al.: 1999, Solar Phys. 187, 5.
Strous, L. H.: 1994, in R. J. Rutten and C. J. Schrijver (eds.), Solar Surface Magnetism, Kluwer, Dordrecht, p. 73.
Title, A., Topka, K., Tarbell, T. et al.: 1992, Astrophys. J. 393, 782.
van Driel-Gesztelyi, L. and Leka, K.: 1994, in Balasubramaniam and Simon (eds.), 'Solar active region evolution: comparing models with observations', ASP Conference Series 68, 138.
Yi, Z. and Engvold, O.: 1993, Solar Phys. 144, 1.
Yoshimura, K., Kurokawa H., Sano, S., and Hudson, H: 1996, Magnetohydrodynamic Phenomena in the Solar Atmosphere, Kluwer Academic Publishers, Dordrecht, Holland, p. 457.
Zwaan, C.: 1985, Solar Phys. 100, 397.
Zwaan, C.: 1992, in J. H. Thomas and N. O. Weiss (eds.), Sunspots: Theory and Observations, Kluwer Academic Publishers, Dordrecht, Holland, p. 75.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Deng, Y., Schmieder, B., Engvold, O. et al. Emergence of sheared magnetic flux tubes in an active region observed with the SVST and TRACE. Solar Physics 195, 347–366 (2000). https://doi.org/10.1023/A:1005299227675
Issue Date:
DOI: https://doi.org/10.1023/A:1005299227675