Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985cha%26a...9..134l&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 9, Issue 2, p. 134-138.
Astronomy and Astrophysics
Astrophysics
Scientific paper
Using the force-free model and the observed photospheric fields as boundary conditions, we calculated the three-dimensional magnetic field of the active region Hale 16747 and discussed its structure and evolution. The results show that 1) the magnetic flux tubes twisted continuously during their rise; 2) the twisting was mainly due to the counter-clock wise rotation of the preceding sunspots and the development of the δ structure in the middle of the region; 3) the thin dark filaments seen on April 5 east of the preceding sunspots ran in the direction of the transverse field, hence were probably the trajectories of mass motion; 4) the time rate of solar flare occurrence in this region can be explained by the evolution of the magnetic field; 5) the two homologons flares on April 7 and 8 resulted from two sets of magnetic arches located in series. These results support to some extent speculations given in Refs. [1] and [2].
Ding You-Ji
Hong Qin-Fang
Lin Yuan-Zhang
Wang Zheng-Zhi
Wu Fei-Fei
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