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
Jan 20, 2016
2007 PROM WORKSHOPSpace Sciences Lab / UC-Berkeley
Sheared-Field Prominences and the Eruptive Implications of Magnetic
Topology
B. J. Lynch, Y. Li, J. G. LuhmannS. K. Antiochos, C. R. DeVore
Two Basic CME Source Region Topologies
approximately
[Y. Li, 2006]
[Y. Li, 2006]
approximately
bipo
lar
mul
tipo
lar
Emo : “Maximally Open” ( 0% blue-red reconnection )
Emc : “Maximally Closed”( 100% blue-red reconnection )
Topology Determines Open State(s)bi
pola
rm
ulti
pola
r
only one Open State possibility
[DeVore et al., 2005]
B2
[DeVore et al., 2005]
[MacNeice et al., 2004]
(Br2+B
2)K.E.
0% rxn
100% rxn
Energy Evolution of MultipolarConfiguration 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 = 15000 s
Flare reconnection starts
Magnetic + Kinetic Energy Evolution
Bipolar: EM(0) = 4.117e+31 ergsMultipolar: EM(0) = 2.566e+31 ergs
Initial (Potential) Magnetic Energies
EM=EM(t)-EM(0)
Notice the magnetic energy signature of the Br diffusion
EDIFF ~ 3.90e+31 ergs !!
Moderately fast breakout eruption (~500 km/s), but the rapid conversion from EM EK 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 s t = 7500 s t = 10000 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 Fieldlines3D Erupting Fieldlines
And because we can’t let the data folks have all the fun…