Temporal evolution of the magnetic topology of the NOAA active region 11158

Journal Article · Tue May 20 00:00:00 EDT 2014 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/787/1/88· OSTI ID:22356819

Zhao, Jie; Li, Hui ^[1]; Pariat, Etienne; Schmieder, Brigitte ^[2]; Guo, Yang ^[3]; Wiegelmann, Thomas ^[4]

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1. Purple Mountain Observatory, CAS, 2 West Beijing Road, Nanjing 210008 (China)
2. LESIA, Observatoire de Paris, Section de Meudon, F-92195, Meudon Principal Cedex (France)
3. School of Astronomy and Space Science, Nanjing University, Nanjing 210093 (China)
4. Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, D-37077 Göttingen (Germany)

We studied the temporal evolution of the magnetic topology of the active region (AR) 11158 based on the reconstructed three-dimensional magnetic fields in the corona. The non-linear force-free field extrapolation method was applied to the 12 minute cadence data obtained with the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory during 5 days. By calculating the squashing degree factor Q in the volume, the derived quasi-separatrix layers (QSLs) show that this AR has an overall topology, resulting from a magnetic quadrupole, including a hyperbolic flux tube (HFT) configuration that is relatively stable at the timescale of the flare (∼1-2 hr). A strong QSL, which corresponds to some highly sheared arcades that might be related to the formation of a flux rope, is prominent just before the M6.6 and X2.2 flares, respectively. These facts indicate the close relationship between the strong QSL and the high flare productivity of AR 11158. In addition, with a close inspection of the topology, we found a small-scale HFT that has an inverse tear-drop structure above the aforementioned QSL before the X2.2 flare. It indicates the existence of magnetic flux rope at this place. Even though a global configuration (HFT) is recognized in this AR, it turns out that the large-scale HFT only plays a secondary role during the eruption. In conclusion, we dismiss a trigger based on the breakout model and highlight the central role of the flux rope in the related eruption.

• OSTI ID: 22356819
• Journal Information: Astrophysical Journal, Vol. 787, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
CONFIGURATION
ERUPTION
EVOLUTION
EXTRAPOLATION
IMAGES
INSPECTION
MAGNETIC FIELDS
MAGNETIC FLUX
NONLINEAR PROBLEMS
SUN
THREE-DIMENSIONAL CALCULATIONS
TOPOLOGY