2002 May 1 MURI VMG mini-workshop 1`

Solar MURI Vector Magnetogram Mini-Workshop

Using Vector Magnetograms in Theoretical Models:

Plan of Action

2002 May 1 MURI VMG mini-workshop 2`

Overview of the plan

Phase I

1. Analyze available data for 1998 May 1 event

2. Construct coronal magnetic equilibria

3. Develop velocity inversion methods

4. Test velocity inversion methods

5. Study a second (simpler) event

Phase II

1. Carry out MHD simulations

2. Couple coronal and IP codes

Phase III

1. Validation of modelling using available solar and IP data

2002 May 1 MURI VMG mini-workshop 3`

Analyze available data for 1998 May 1 event

1. Generate a sequence of IVM magnetograms for the 1998 May 1 23:40 UT halo CME event (AR 8210), time cadence ~15 min (too slow ?), before, during, and after eruption. (Regnier)

2. Estimate the magnetic field uncertainties.(Metcalf, Leka)3. Determine line of sight and transverse velocities.

(Welsch, Metcalf)4. Analyze the global solar (Li, Liu) and IP (Li, Luhmann)

context (spatial, temporal) of this event, time scale ~ several days, including previous and following events.

5. Make an instrument vs time array on WWW (Li)

2002 May 1 MURI VMG mini-workshop 4`

Construct coronal magnetic equilibria

1. Build force-free magnetic field models for each magnetogram, combined with a potential extrapolation of MDI data. (Regnier)

2. Build magnetostatic models from the same magnetograms (Heinemann).

3. Compare force-free magnetic field models to available coronal imaging data (Canfield, Metcalf)

4. Compare connectivity of force-free models to that of point charge models (Regnier, Longcope, Leka)

2002 May 1 MURI VMG mini-workshop 5`

Develop velocity inversion methods

1. Use vertical component of induction equation to derive velocity fields (Longcope, Fisher, Welsch)

2. Constrain the solutions by minimizing total kinetic energy (ditto)

2002 May 1 MURI VMG mini-workshop 6`

Test velocity inversion methods

1. Generate fake magnetogram sequences from the MHD simulations (Abbett, Fisher)

2. Use velocity inversion techniques to infer velocities from these sequences (ditto + Welsch)

3. Compare photospheric boundary velocities from the simulation to those inferred from the inversion (same as 2)

4. Explore implications of magnetogram uncertainties through Monte Carlo methods (same as 2).

5. Compare velocities from the inversion to IVM observations (Welsch, Metcalf, Abbett, Fisher)

2002 May 1 MURI VMG mini-workshop 7`

Study a second (simpler) event (Liu)

1. Identify a simpler solar and IP event for analysis (1997 May 12 halo CME in AR8038 ?).

2. Produce a vector magnetogram (Solar Flare Telescope / Mitaka ?) sequence for this event.

3. Carry out an analysis parallel to that of the 1998 May 1 event (no velocity observations available – or use LCT methods for v_t, MDI for v_l?) (Liu + Welsch)

2002 May 1 MURI VMG mini-workshop 8`

Carry out MHD simulations

• Do Zeus AMR simulations using real magnetic field data near time of CME using synoptic magnetic field solutions as boundary condition. (Berkeley mafia)

• Couple coronal and interplanetary codes

(Abbett, Ledvina, Odstrcil)