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== GEM 2008 Modeling  Challenge ==

Following the discussion at the Metric and Validation Session during
the GEM 2008 Workshop at Zermatt, the GGCM Metrics and Validation
Focus Group is organizing Modeling Challenge focusing on the inner
magnetospheric dynamics and ground magnetic perturbations.  Community
Coordinating Modeling Center (CCMC) is supporting the Challenge.

'''Four events have been chosen:'''

*Event 1: October 29th, 2003 06:00 UT - October 30th, 0600 UT
*Event 2: December 14, 2006 12:00 UT - December 16, 00:00 UT
*Event 3: August 31, 2001 00:00 UT - September  1, 00:00 UT
*Event 4: August 31, 2005 10:00 UT - September  1, 12:00 UT

'''The Challenge involves the following model/data comparisons (metrics studies):'''

*Metrics 1: Magnetic field at geosynchronous orbit (GOES)
*Metrics 2: Magnetopause crossings by geosynchronous satellite (GOES and LANL)
*Metrics 3: Plasma density/temperature at geosynchronous orbit (LANL)
*Metrics 4: Ground magnetic perturbations (ground based magnetometers)

Details of the Challenge and instruction on how to participate can be
found at the Community Coordinated Modeling Center (CCMC) web site:
http://ccmc.gsfc.nasa.gov/

Challenge participants can upload model results using CCMC Web
interface at http://ccmc.gsfc.nasa.gov/support/GEM_metrics_08/


The CCMC will perform the model/data comparison for submitted
simulation output. CCMC will keep track of both the data and model
results.


Uploading the model results for one event simulated using certain
model settings can be done in one submission. For each simulated event
the modelers are invited to submit simulation results for one or more
metrics studies (which can be selected during the submission
procedure). For example, if your model calculates only magnetopause
crossings or only ground magnetic perturbations, you can still
participate.


Multiple submissions from the same participant for the same event and
the same model but different model settings (e.g., for different model
versions, different simulation grids, different ionosphere conductance
models, different coupling options with inner magnetosphere, etc.) are
possible. This will allow us to demonstrate what can be done in near-
real-time and in a more science-grade production, as well as to
demonstrate the effect of model coupling.


The first results of the Challenge will be discussed at the GEM mini-
workshop at the Fall AGU. Using the experience of these preliminary
metrics studies we will discuss what modifications to the challenge
procedure should be made and whether we should modify the list of
events selected for the comparison.


To participate in this first round of the Challenge please submit your
model results using CCMC's on-line submission interface prior to
November 15, 2008.


'''Please send questions and comments to:'''

Masha Kuznetsova (''Maria.M.Kuznetsova[at]nasa.gov),
Aaron Ridley (ridley[at]umich.edu'')