@article{XueYanChengetal.2016, author = {Xue, Zhike and Yan, Xiaoli and Cheng, Xin and Yang, Liheng and Su, Yingna and Kliem, Bernhard and Zhang, Jun and Liu, Zhong and Bi, Yi and Xiang, Yongyuan and Yang, Kai and Zhao, Li}, title = {Observing the release of twist by magnetic reconnection in a solar filament eruption}, series = {Nature Communications}, volume = {7}, journal = {Nature Communications}, publisher = {Nature Publ. Group}, address = {London}, issn = {2041-1723}, doi = {10.1038/ncomms11837}, pages = {11}, year = {2016}, abstract = {Magnetic reconnection is a fundamental process of topology change and energy release, taking place in plasmas on the Sun, in space, in astrophysical objects and in the laboratory. However, observational evidence has been relatively rare and typically only partial. Here we present evidence of fast reconnection in a solar filament eruption using high-resolution H-alpha images from the New Vacuum Solar Telescope, supplemented by extreme ultraviolet observations. The reconnection is seen to occur between a set of ambient chromospheric fibrils and the filament itself. This allows for the relaxation of magnetic tension in the filament by an untwisting motion, demonstrating a flux rope structure. The topology change and untwisting are also found through nonlinear force-free field modelling of the active region in combination with magnetohydrodynamic simulation. These results demonstrate a new role for reconnection in solar eruptions: the release of magnetic twist.}, language = {en} } @misc{SuKliemvanBallegooijenetal.2012, author = {Su, Yingna and Kliem, Bernhard and van Ballegooijen, Adriaan and Deluca, Edward}, title = {Numerical simulations of the CME on 2010 April 8}, series = {Solar and Astrophysical Dynamos and Magnetic Activity}, journal = {Solar and Astrophysical Dynamos and Magnetic Activity}, number = {674}, issn = {1866-8372}, doi = {10.25932/publishup-41488}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-414887}, pages = {575 -- 576}, year = {2012}, abstract = {We present 3D zero-beta ideal MHD simulations of the solar flare/CME event that occurred in Active Region 11060 on 2010 April 8. The initial magnetic configurations of the two simulations are stable nonlinear force-free field and unstable magnetic field models constructed by Su et al. (2011) using the flux rope insertion method. The MHD simulations confirm that the stable model relaxes to a stable equilibrium, while the unstable model erupts as a CME. Comparisons between observations and MHD simulations of the CME are also presented.}, language = {en} }