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			 **   THE GEM MESSENGER   **
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						     Volume 11, Number 23
						     August 3, 2001
						     
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Reports of 2001 GEM Snowmass Workshops 
Report of the GGCM Steering Committee to the GEM Steering Committee
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From: George Siscoe, Chair, GGCM Steering Committee

I.	GGCM Metrics Challenge

The metrics challenge that Rich Behnke presented to the Steering 
Committee last year has been successfully completed.  The results were
presented and discussed at a GGCM metrics session.  Based on the 
experience of this challenge, the Steering Committee recommends the
following:

1. Continue periodic metrics challenges with a period (initially at
   least) of 2 years, to be adjusted as experience warrants.

2. Maintain the present metric.  It worked satisfactorily.

3. Add new metrics:
   1. Integral potential along CUSP trajectory between pre-
      established points.
   2. Magnetic field perturbation along trajectory (100 km averages)
   3. Pattern-recognition metric based on locating convection reversals.
   4. In addition to absolute errors used in the 1st challenge,
      compute skill score based on Weimer 2000 potentials and field 
      perturbations.
   5. Compute such skill scores for the results of the 1st challenge.
   6. Make subsequent challenges as "blind" as possible.
   7. Submit a report to Rich Behnke on the results of the 1st
      challenge that contains:  
	1. View graphs prepared by Michael Hesse that summarize the 
           results of the challenge and that contain further 
	   recommendations aimed at standardizing the procedure and
	   at illuminating problems that arose during the 1st challenge.  
        2. Recommendations (above) of the Steering Committee.  
        3. A  description of the CUSP instruments and the uncertainties
	   of the measurements. This request will be distributed to all 
	   challenge participants.

   8. Publish a joint paper on the results of the challenge.

II.    Recommendation to NSF regarding a GGCM motivated effort to design
an architecture for interfacing at CCMC, independently created codes - 
establish a task group to recommend on the merits of existing architectures
designed for this purpose.  The recommendations should be to the CCMC 
Steering Committee.  Chuck Goodrich would be a good chair of such a task
group.

III.    Relation between GEM and CCMC.  CCMC has now achieved the goal of 
the GGCM  3-phased implementation plan.  It is extending its capabilities
in this area beyond GGCM's preview to include also ionospheric and 
heliospheric codes.  The Steering Committee therefore recommends that
GEM interface itself with CCMC in a way that insures that the interests
of GEM are maintained and promoted.  Steering Committee recommends the
following plan to achieve this end.  1.  Dissolve the GGCM Steering
Committee, since CCMC has accomplished the job that the Steering Committee
was created to achieve.  Now the Steering Committee is too weak a link
between GEM and CCMC.  2.  Appoint the CCMC director as an ex officio
member of the GEM Steering Committee.  3.  Establish 2 GGCM working groups,
one, a GGCM Issues working group, to run sessions on metrics, CCMC 
issues, etc., and one, a GGCM Models working group to arrange session 
that demonstrates the capabilities of models and their applications to other
GEM campaigns. The Steering Committee recommends that the CCMC director
be an appointed leader of the Model WG.  Further recommendations regarding
WG leaders are the following:  Models WG - Michael Wiltberger.  Issues WG -
Aaron Ridley and Chuck Goodrich as backup, the names of Margaret Chen 
and Gang Lu are suggested.

Respectfully submitted,

George Siscoe
Chair, GGCM Steering Committee

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