2007 PROM WORKSHOP Space Sciences Lab / UC-Berkeley Sheared-Field Prominences and the Eruptive Implications of Magnetic Topology B. J. Lynch, Y. Li, J.

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Presentation transcript:

2007 PROM WORKSHOP Space Sciences Lab / UC-Berkeley Sheared-Field Prominences and the Eruptive Implications of Magnetic Topology B. J. Lynch, Y. Li, J. G. Luhmann S. K. Antiochos, C. R. DeVore

Two Basic CME Source Region Topologies approximately [Y. Li, 2006] approximately bipolar multipolar

 E mo : “Maximally Open” ( 0% blue-red reconnection )  E mc : “Maximally Closed” ( 100% blue-red reconnection ) Topology Determines Open State(s) bipolar multipolar only one Open State possibility [DeVore et al., 2005]

B2B2 [MacNeice et al., 2004]  (B r 2 +B  2 ) K.E. 0% rxn 100% rxn Energy Evolution of Multipolar Configuration in 2.5D In MHD treatments of multipolar topologies, you can approach the no-reconnection limit before it “switches on”

Magnetic Neutral Lines 3D Null Point Bipolar Multipolar Magnetic Topologies in 3D Magnetic Neutral Line

Bipolar Multipolar Surface Field Evolution

Radial Velocity Evolution (  =0) Bipolar Multipolar

Magnetic Fieldline Evolution Bipolar Multipolar t = s

Flare reconnection starts Magnetic + Kinetic Energy Evolution Bipolar: E M (0) = 4.117e+31 ergs Multipolar: E M (0) = 2.566e+31 ergs Initial (Potential) Magnetic Energies  E M =E M (t)-E M (0) Notice the magnetic energy signature of the Br diffusion  E DIFF ~ 3.90e+31 ergs !! Moderately fast breakout eruption (~500 km/s), but the rapid conversion from E M  E K not super impressive BUT, the Bipolar case doesn’t show any sign of eruption!

Summary & Current/Future Work Bipolar Arcades Don’t Erupt Without Something Else Happening !!! Aly-Sturrock holds up in 3D! Breakout works in 3D and probably for the reasons we think… Theorists & modelers may still be relevant! Next simulation— Get rid of that inner-boundary Br diffusion! Slower driving, “cleaner” magnetic, kinetic energy profiles (so far, so good… ) t = 5000 st = 7500 s t = s

Sheared Field Prominence Structure Three perspectives of the non-eruptive Bipolar fieldlines at t=15,000 seconds Essentially the spherical version of sheared-arcade prominence model… [DeVore & Antiochos, 2000 and others]

3D Erupting Fieldlines And because we can’t let the data folks have all the fun…

2D null line (a) Initial Potential State Four flux systems Sheared filament channel (b) Breakout Reconnection Leads to Eruption Overlying flux transferred to side arcades Separatrices move poleward and equatorward (c) Eruption-Driven Flare Reconnection Rapid magnetic energy release Rebuilds unsheared arcade (d) Anti-Breakout Reconnection Separatrices move back Null point reforms

2D null line 3D null point Magnetic neutral line Separatrix boundary Spine fieldline footpoint CME-opened field Sheared field region/ Erupting filament