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CME & Magnetospheric Substorm Initiation Mechanisms

CME & Magnetospheric Substorm Initiation Mechanisms. Comparison of Plasma Environments. 1. Energy Storage. 2. Trigger Mechanism. 3. Energy Release. Interchange Reconnection. Crooker & Webb 2006. Substorm Energy Storage. solar wind kinetic energy converted to magnetic energy.

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CME & Magnetospheric Substorm Initiation Mechanisms

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  1. CME & Magnetospheric Substorm Initiation Mechanisms

  2. Comparison of Plasma Environments

  3. 1. Energy Storage 2. Trigger Mechanism 3. Energy Release

  4. Interchange Reconnection Crooker & Webb 2006

  5. Substorm Energy Storage solar wind kinetic energy converted to magnetic energy growth phase SW kinetic energy magnetic energy substorm onset magnetic energy heat kinetic

  6. Commencement of Substorm Growth Phase AE: Auroral Electroject Index Bz: North-South Magnetic Field Component Foster et al. 1971

  7. 2D Asymmetric Quadrupole Model critical points flux rope x-line flux rope height y strength of new emerging flux (NEF) x NEF test of “tether-cutting” concept

  8. Loss of Equilibrium Model

  9. Flux Rope Emergence & Eruption 3D simulations of Fan & Gibson (2006)

  10. Role of Reconnection in the Breakout Model

  11. What is the Trigger Mechanism in the Breakout Model? 1. 2. 3. 1. 2. 3. initial state (j = 0) magnetic energy energy build-up free magnetic energy post eruption lower x-line appears

  12. 3D CME Model Derived from Magnetotail Model initial state: front view side view dynamic state: helmet streamer field lines split flux rope from Birn, Forbes & Hesse 2006

  13. Comparisons 1. Growth Phase magnetospheric: creation of tail current sheet, well understood solar: force-free currents, subsurface, poorly understood 2. Onset Mechanism magnetospheric: kinetic versus ideal-MHD process solar: kinetic versus ideal-MHD process, hybrid process 3. Energy Release magnetospheric: current sheet dynamics, ionosphere solar: current sheet dynamics, thermal conduction, radiation

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