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			 **   THE GEM MESSENGER   **
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						     Volume 6, Number 30
						     June 11, 1996

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PROGRAM FOR JOINT WG-1/GGCM MODEL-DATA COMPARISON SESSION ON TUESDAY, JUNE 25
Updated
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From: "Larry Lyons" <larry_lyons at qmail2.aero.org>


The GEM steering committee recommended that Working Groups 1 and 5 (GGCM)
coordinate model-data comparison studies for GEM periods.  Plans for first
comparisons for stable IMF intervals, Jan. 27-28, 1992 were formulated in
Boulder on the Saturday after the January meeting of WG-5. 

INTERVALS in order of priority:

  1.  ---- 28 Jan., 01:15 UT +/- 170 min:  B ~ (7,-13,-7) nT (large By,
negative Bz)

  2.  ---- 27 Jan., 15:20 UT +/- 115 min:  B ~ (5,-20,5) nT (large By,
positive Bz)

  3.  ---- 28 Jan., 19:05 UT +/- 45 min:   B ~ (9,-2,4) nT (small By, positive
Bz)

  4.  ---- 27 Jan., 18:30 UT +/- 60 min:   B ~ (5,-18,-3) nT (large By,
negative Bz)

HAVE AVAILABLE (and put on GEM homepage by Bob McPherron):

  1.  "Synoptic space weather maps", including AMIE potentials, and separatrix
and polar-cap boundary layer identifications

  2.  AMIE ionospheric and field-aligned currents

  3.  Standardized IMF & solar wind data


WILL COMPARE:

  1.  Potential patterns

  2.  Separatrix location versus MLT

  3.  Boundary layers within polar cap, including mantle, inner edge of cusp
ion dispersion, and "soft-electron zone" (SEZ)

  4.  Field-aligned and ionospheric currents

  5.  Auroral indices

PROGRAM

8:00-8:05:  Setting the Scene (Chair:  George Siscoe)

8:05-8:25:  Observations Framework (L. Lyons)

8:25-8:30:  Input Data (R. McPherron)

08:30-10:00:  Presentation from the following modeling groups

      1.  Magnetosheath velocities, densities, and temperatures (Stahara,
Spreiter)

      2.  Construction of the AL, AU, and Dst indices from IMP-8 solar
wind/IMF, and the Polar Cap index. (Vassiliadis)

      3.  New model of polar cap electric potentials that can produce a
pattern for any arbitrary IMF (Weimer)

      4.  IZMIRAN Electrodynamic Model (IZMEM) potentials (available at
http://www.sprl.umich.edu/MIST) and AE index using only IMF input
(Papitashvili)

      5.  Calculation of particle distributions for comparison with DMSP,
using Toffoletto-Hill model outputs (Onsager)  

      6.  Global model results (Winglee)

10:00-10:20:  Break

10:20-11:40   Presentation from the following modeling groups

      7.  Potentials and separatrix in Toffoletto-Hill model using
Stahara-Spreiter magnetosheath velocities (Toffoletto)    
  
      8.  Schulz source-surface model separatrix, potentials, and boundary
layers (Peroomian)

      9.  NRL MHD (Lyon)

     10.  UCLA MHD (Raeder, Berchem)

 
Larry Lyons (Larry_Lyons at qmail2.Aero.org)
Alan Rodger (A.Rodger at bas.ac.uk)
George Siscoe (Siscoe at buasta.bu.edu)




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