secchi observations constraining the initiation of polar coronal jets spiros patsourakos, nrl with:...
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SECCHI Observations Constraining The SECCHI Observations Constraining The Initiation of Polar Coronal JetsInitiation of Polar Coronal Jets
Spiros Patsourakos, NRLSpiros Patsourakos, NRL
with:E. PariatA. VourlidasS. AntiochosR. Howard
SHOW HOW SECCHI CAN CONSTRAIN JET INITIATION
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Why Care About Jets ?Why Care About Jets ?
Very possibly driven by magnetic reconnection
Ideal prototype to study reconnection in simple magnetic setups
Could be an important contributor to solar wind mass
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Magnetic Twist as a Driver of Polar JetsMagnetic Twist as a Driver of Polar Jets
Axissymetric configuration3D MHD simulations
Apply twist
kink
A high speed ~ VA formswith helical structure
a fraction of observed jets exhibit similar properties
Pariat et al. 2007
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Critical Elements of The Twist ModelCritical Elements of The Twist Model
Kink instability - High Speed Outflow - Helical structure
Can SECCHI 3D Observations constrain those elements ?
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Recap of the Observations Recap of the Observations
multipolar topology slow rise kink rapid acceleration & helical structure
7 June 2007 ~ 05:00 UTNorth Polar Coronal HoleA-B ~ 11 degreesObserved by EUVI, COR1, COR2
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Height-time plot of the JetHeight-time plot of the Jet
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‘ ‘Real’ Velocity of the JetReal’ Velocity of the Jet
slow rise
Rapid acceleration @ fractionof Va
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3D Trajectory of the Jet 3D Trajectory of the Jet
evidence of kink
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Helical Structure of the Jet IHelical Structure of the Jet I
Small but noticeable differences between A & Bwhich increase with time
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Helical Structure of the Jet IIHelical Structure of the Jet II
Edge-on
Face-on
The Helical Structure is REAL !
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Helical Structure of the Jet IIIHelical Structure of the Jet III
Edge-enhanced Images
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Emulating SECCHI ObservationsEmulating SECCHI Observations
mass isosurfaces
~ 10 degrees
evident differences
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Work in Progress
Assemble a database of jets
More realistic comparisons between obs-modeling
Establish a firm link between jets observations from EUVI & CORs
t=1060 t=1120t=1080 t=1200t=1160
X
X
Y
Y
los
2
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SummarySummary
Taking advantage of the unique characteristics of STEREO to:
(1) Calculate ‘real’ v(2) Demonstrate kink in action(3) Demonstrate evidence of helical structure
twist can drive polar jets
Performed the first 3D observations of polar jets
SECCHI CAN STRONGLY CONSTRAIN JET INITIATION
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Work In Progress: More Realistic Model-Obs Work In Progress: More Realistic Model-Obs ComparisonsComparisons
t=1060 t=1120t=1080 t=1200t=1160
X
X
Y
Y
los
2
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Acceleration of the JetAcceleration of the Jet
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Other Examples of Helical Jets Other Examples of Helical Jets
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Difference Images Difference Images
base diff
run diff
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Observing Strategies with SECCHI Observing Strategies with SECCHI
Probably focus on 195 & 304 : higher constrast
Coordinate with Hinode
Run a pilot program soon. The SC seperation gets too big
Synop cadence in 171 probably OK.But
higher cadence (~30 s) in required in order to see in 3D the jet oscillations that XRT sees. PFIs ?
Deeper exposures with CORs ? Anything in HIs ?
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171, 195, 304 Movies 171, 195, 304 Movies