Three-Dimensional Sigmoidal Structure on the Flare-Producing Solar Active Region

Details Three-Dimensional Sigmoidal Structure on the Flare-Producing Solar Active Region Three-Dimensional Sigmoidal Structure on the Flare-Producing Solar Active Region

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm51a1342i&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM51A-1342

Astronomy and Astrophysics

Astrophysics

[7519] Solar Physics, Astrophysics, And Astronomy / Flares, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields, [7900] Space Weather, [7959] Space Weather / Models

Scientific paper

Three-dimensional (3D) magnetic topology is a key process to understand the solar active phenomena and it is essential toward the goal of the space weather prediction. Especially, because the “Sigmoid”, which is highly sheared magnetic field, is observed by X - ray telescope before the solar flares, we have considered as a precursor of that. However, because we can find the only two-dimensional information from the observation, 3D structure is not fully understood. In this study, 3D coronal magnetic field was extrapolated based on the vercormagnetogram data on Dec.12,2006 from Hinode/SP data under the Nonlinear Force-Free (NLFF) approximation and the purpose of this study is to clarify the 3D Sigmoidal structure of the flare-producing solar active region. As a result, we clearly find that the sigmoidal structure is not composed of the single magnetic flux but also the multiple structures. This result indicates the Sigmoid has very complex structure. The height of magnetic loop, where the X-ray intensity is strongest region, is about 10000(km) and the curve region of “S” shaped structure is about 60000(km). Furthermore, from the Quasi-Separatrix Layers (QSL), we clearly find that the part of magnetic flux surrounded by QSL corresponds to the region where the X-ray intensity is strongest. We will also report about the comparison with the flux emergence simulation from Magara 2004 and 180-deg. ambiguity.

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