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1Yang Liu1997 May 12 Event The 1997 May 12 Event Yang Liu – Stanford University

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1 1Yang Liu1997 May 12 Event The 1997 May 12 Event Yang Liu – Stanford University yliu@solar.stanford.edu

2 2Yang Liu1997 May 12 Event The 1997 May 12 Event Observations for this event. Vector magnetic field data reduction. Variation of magnetic field during this event. Extrapolation of the coronal magnetic field. Disturbance at the north pole. Modeling for the presumed flux rope.

3 3Yang Liu1997 May 12 Event Observations of this event—solar surface Ha MDI

4 4Yang Liu1997 May 12 Event Observations of this event—solar surface Observation shows a classic two-ribbon flare. SXTEIT Ha MDI

5 5Yang Liu1997 May 12 Event Observations of this event—corona/heliosphere Full Halo CME LDE Slow CME

6 6Yang Liu1997 May 12 Event Observations of this event—corona/heliosphere MC Bs Full Halo CME LDE Slow CME

7 7Yang Liu1997 May 12 Event Observations of this event--summary A typical two-ribbon flare; Long decay phase; A filament’s eruption; EUV double dimming; EIT wave; A slow full-halo CME; A magnetic cloud; A geomagnetic storm.

8 8Yang Liu1997 May 12 Event Vector magnetic field data—before the event. Vector data before the flare (Mitaka)

9 9Yang Liu1997 May 12 Event Vector magnetic field data—before the event. Vector data before the flare (Mitaka)

10 10Yang Liu1997 May 12 Event Vector magnetic field data—before the event. Vector data before the flare (Mitaka)

11 11Yang Liu1997 May 12 Event Vector magnetic field data—before the event. Vector data before the flare (Mitaka)

12 12Yang Liu1997 May 12 Event Vector magnetic field data—before the event. Vector data before the flare (Mitaka)

13 13Yang Liu1997 May 12 Event Vector magnetic field data—before the event. Vector data before the flare (Mitaka)

14 14Yang Liu1997 May 12 Event Vector magnetic field data—after the event. Vector data after the flare (19:23UT @ Mees)

15 15Yang Liu1997 May 12 Event Variation of magnetic field during the event—on small scale Vector magnetic field

16 16Yang Liu1997 May 12 Event Variation of magnetic field during the event—on small scale Vector magnetic field Histograms for magnetic shear angle

17 17Yang Liu1997 May 12 Event Variation of magnetic field during the event—on small scale Magnetic fields appear changes on small scale after the flare. Vector magnetic field Vertical electric current, over-plotted by the line-of-sight magnetograms Histograms for magnetic shear angle

18 18Yang Liu1997 May 12 Event Variation of magnetic field during the event—on large scale Magnetic field appears changes in large-scale fields after the flare. PFSS model for coronal field Average height of field lines above AR8038 Change of magnetic field

19 19Yang Liu1997 May 12 Event Evolution of magnetic field of AR8038.

20 20Yang Liu1997 May 12 Event Evolution of magnetic field of AR8038.

21 21Yang Liu1997 May 12 Event Evolution of magnetic field of AR8038.

22 22Yang Liu1997 May 12 Event Evolution of magnetic field of AR8038.

23 23Yang Liu1997 May 12 Event Extrapolation of coronal magnetic field.

24 24Yang Liu1997 May 12 Event Disturbance at the north pole

25 25Yang Liu1997 May 12 Event Modeling the presumed flux rope Modelrdistancefluxelectrictwist 10^9cm 10^20Mx10^11Aπ obs2.89.61.012.690.80 TD model2.89.61.013.170.94 TD model: Titov and Demoulin (1999) propose a flux rope model. The ring current along the rope can be estimated from available observation.

26 26Yang Liu1997 May 12 Event Modeling the presumed flux rope Modelrdistancefluxelectrictwist 10^9cm 10^20Mx10^11Aπ obs2.89.61.012.690.80 TD model2.89.61.013.170.94 Tested by LFFF TD model: Titov and Demoulin (1999) propose a flux rope model. The ring current along the rope can be estimated from available observation.

27 27Yang Liu1997 May 12 Event Modeling the presumed flux rope Modelrdistancefluxelectrictwist 10^9cm 10^20Mx10^11Aπ obs2.89.61.012.690.80 TD model2.89.61.013.170.94 Tested by LFFF The twists from these two methods are in reasonable agreement, but both are much less than the one for eruptive prominences (Vrsnak, et al, 1991), and also less than the theoretical one for a kink instability, implying that the twist alone might be insufficient to lead to this eruption. TD model: Titov and Demoulin (1999) propose a flux rope model. The ring current along the rope can be estimated from available observation.

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