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			 **   THE GEM MESSENGER   **
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						     Volume 16, Number 16
						     May 29, 2006

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GGCM Working Group:  Modules and Novel Techniques
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From: John Dorelli <john.dorelli at unh.edu>

The new GGCM Working Group, Modules and Novel Techniques, will address a 
broad range of topics related to GGCM development, including module 
development, code coupling, new simulation techniques and data assimilation.
One powerful approach to GGCM design consists of using global MHD as the 
computational "spine" of the model, adding additional physics where needed 
(e.g., by coupling the global MHD simulation to a kinetic model of the 
inner magnetosphere).  Despite its successes, however, the MHD approach 
suffers from a number of well known deficiencies (e.g., its inability to 
model fast magnetic reconnection in the high Lundquist number limit, its 
neglect of finite Larmor radius and nonlocal transport effects, etc.).  To 
start things off this year, we would like to address the problem of how to 
move beyond MHD to a more accurate multiscale global model of the 
magnetosphere.  To this end, the GGCM WG2 breakout session, "Modeling the 
Magnetosphere on Multiple Scales", will address the following topics:

1.  Techniques for including kinetic effects in a global MHD simulation.
2.  Global kinetic modeling

We would like to keep the format as open as possible, but there will be 
several scheduled talks to stimulate discussion.

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