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SECCHI Observations Constraining The Initiation of Polar Coronal Jets

SECCHI Observations Constraining The Initiation of Polar Coronal Jets. Spiros Patsourakos, NRL. SHOW HOW SECCHI CAN CONSTRAIN JET INITIATION. with: E. Pariat A. Vourlidas S. Antiochos R. Howard. Why Care About Jets ?. Very possibly driven by magnetic reconnection

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SECCHI Observations Constraining The Initiation of Polar Coronal Jets

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  1. SECCHI Observations Constraining The Initiation of Polar Coronal Jets Spiros Patsourakos, NRL SHOW HOW SECCHI CAN CONSTRAIN JET INITIATION with: E. Pariat A. Vourlidas S. Antiochos R. Howard

  2. 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

  3. Magnetic Twist as a Driver of Polar Jets Axissymetric configuration 3D MHD simulations A high speed ~ VA forms with helical structure a fraction of observed jets exhibit similar properties Apply twist kink Pariat et al. 2007

  4. Critical Elements of The Twist Model Kink instability - High Speed Outflow - Helical structure Can SECCHI 3D Observations constrain those elements ?

  5. Recap of the Observations 7 June 2007 ~ 05:00 UT North Polar Coronal Hole A-B ~ 11 degrees Observed by EUVI, COR1, COR2 multipolar topology  slow rise  kink  rapid acceleration & helical structure

  6. Height-time plot of the Jet

  7. ‘Real’ Velocity of the Jet Rapid acceleration @ fraction of Va slow rise

  8. 3D Trajectory of the Jet evidence of kink

  9. Helical Structure of the Jet I Small but noticeable differences between A & B which increase with time

  10. Helical Structure of the Jet II Edge-on Face-on The Helical Structure is REAL !

  11. Helical Structure of the Jet III Edge-enhanced Images

  12. Emulating SECCHI Observations mass isosurfaces ~ 10 degrees evident differences

  13. t=1080 t=1120 t=1160 t=1200 t=1060 X Y òlos r2 X Y Work in Progress Assemble a database of jets More realistic comparisons between obs-modeling Establish a firm link between jets observations from EUVI & CORs

  14. Summary Performed the first 3D observations of polar jets • Taking advantage of the unique characteristics of STEREO to: • Calculate ‘real’ v • Demonstrate kink in action • Demonstrate evidence of helical structure • twist can drive polar jets SECCHI CAN STRONGLY CONSTRAIN JET INITIATION

  15. t=1080 t=1120 t=1160 t=1200 t=1060 X Y òlos r2 X Y Work In Progress: More Realistic Model-Obs Comparisons

  16. Acceleration of the Jet

  17. Other Examples of Helical Jets

  18. Difference Images base diff run diff

  19. Observing Strategies with SECCHI Probably focus on 195 & 304 : higher constrast 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 ? Run a pilot program soon. The SC seperation gets too big Coordinate with Hinode

  20. 171, 195, 304 Movies

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