Center for Space Environment Modeling T. H. Zurbuchen, on behalf of W. Manchester, J. Kota, I. Roussev, T. H. Zurbuchen, N.

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Presentation transcript:

Center for Space Environment Modeling T. H. Zurbuchen, on behalf of W. Manchester, J. Kota, I. Roussev, T. H. Zurbuchen, N. Lugaz, D. DeZeeuw, T. Gombosi, I. Sokolov, G. Toth University of Michigan Signatures of fast CME Propagation near 1 AU

Table of Contents  Provide short description of CME model  Use this model to derive eight testable predictions.  Principle  Focus on CME propagation and interaction processes  Use simplest model we know – Gibson-Low.  Recognize that key results should be applicable to most CMEs.

The Gibson-Low Flux Rope  Complex magnetic topology: spheromak flux rope distorted into a 3D tear drop shape  Magnetic field supports the weight of the plasma: magnetic field possess significant free energy Gibson & Low, ApJ 493, 460, 1998

The Ambient Solar Wind

3D View of the flux rope in the corona

The CME in 3D Magenta: magnetic lines of the flux rope Black and green lines: magnetic lines of the helmet streamer. Grey: open field lines. CME Properties Peak velocity > 1000 km/s Flux rope mass = 1.0x10 15 grams Kinetic Energy = 4.0x10 31 ergs

Prediction 1: Shock is deformed around slow solar wind band. High latitudes advance faster.

Prediction 2: Indentation of shock front near current sheet seen by coronagraphs and heliospheric imagers. 2 hours 24 hours

Prediction 3: Post Shock compressions form behind the shock indentation close to the Sun.

Prediction 4: Particle acceleration is effective throughout corona and into heliosphere at the shock and post-shock compressions.

Fermi Acceleration of SEPs at the Shock, by J. Kota

Prediction 5: Post-shock compressions persist to 1 AU.

Prediction 6: In the inner heliosphere, there are B-field enhancement at the back-side of the CME

Prediction 7: CME disturbance expands far beyond CME ejecta. S` Z = 20 Z = 120

Prediction 8: CME field lines are disconnected within 1 AU.

Summary: Predictions at 1 AU  3D flux rope embedded in the steamer with a 3 part density structure  Shock formation and interaction with the bi- modal solar wind deforms the shock front forming a large indentation also bends the cloud forward at high latitude  Large post-shock compressions behind shock indentation  High latitude signatures of CMEs (out side the ejecta) resemble low latitude CMEs with reduced amplitude in B  SEP acceleration at the shock and post-shock compression  The most energetic particles are accelerated close to the Sun