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Characteristics of Flare-Productive Sunspot Groups

Published online by Cambridge University Press:  30 March 2016

Takako T. Ishii
Affiliation:
Kwasan and Hida Observatories, Kyoto University, Yamashina-ku, Kyoto, JAPAN, 607-8471
Hiroki Kurokawa
Affiliation:
Kwasan and Hida Observatories, Kyoto University, Yamashina-ku, Kyoto, JAPAN, 607-8471
Tsutomu T. Takeuchi
Affiliation:
Division of Particle and Astrophysical Sciences, Nagoya University, Nagoya, JAPAN, 464-8602

Abstract

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The mechanism of flare energy build-up is one of the most fundamental questions in the solar flare study, but is still to be solved. From the review of the previous studies, we notice that the formation process of the magnetic shear in an active region should be essential for the flare energy build-up mechanism. Based on this idea, we make detailed studies of the active region evolutions using high resolution Hα images obtained with the 60 cm Domeless Solar Telescope at Hida Observatory, Kyoto University.

We study sunspot proper motions and evolutionary changes of Hα fine structures and magnetic fields in active regions NOAA 5395 (Ishii et al. 1998) and NOAA 4201 (Ishii et al. 2000). To explain the evolutionary characteristics found from the analysis of these two active regions, we propose schematic models of twisted flux bundles emerging from the convection zone. We also found that the occurrence of high flare activity in each active region was restricted to the rapidly emerging region of the twisted flux bundle. In conclusion, we suggest that the emergence of the twisted flux bundle should be the key to high flare-productivity of the sunspot group, or the flare energy build-up mechanism.

Type
II. Joint Discussions
Copyright
Copyright © Astronomical Society of Pacific 2002

References

Ishii, T.T., Kurokawa, H., & Takeuchi, T.T. 1998, ApJ, 499, 898 Google Scholar
Ishii, T.T., Kurokawa, H., & Takeuchi, T.T. 2000, PASJ, 52, 337 Google Scholar