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			 **   THE GEM MESSENGER   **
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						     Volume 15, Number 21
						     May 25, 2005

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MI Coupling Campaign Breakout: Call for Participants: How well do Global Circulation Models (GCMs) reproduce fluctuations on all scales?
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From: Jeff Hughes <hughes@bu.edu>

This session, on Wednesday afternoon of the GEM workshop, will challenge 
modellers and experimenters to characterise the statistical properties of 
fluctuations in the M-I system (e.g., power spectra in time and space, 
probability distributions of fluctuations (e.g., velocity differences) at
varying separations in time and space, etc.)  and to compare these 
properties in order to answer specific questions:

+ Are there preferred time and space scales?
+ Is the M-I system turbulent?
+ Are fluctuations the same in models and data?
+ What are the limiting scales of models and data?
+ Can we parameterise fluctuations on sub-grid scales? (for models and
  experiments)
+ How does our ability to model and measure structure at different scales
  affect space weather prediction?  (e.g., contribution of small-scale
  structure to Joule heating, coupling between kinetic and MHD scales in
  reconnection and substorms and aurora, etc.)

The challenge to modellers and experimenters is to look at much larger
quantities of data than usual in order to access varying scales and get
good statistics.  How do we do this?  Do we need new instruments,
computers, technologies?

If you wish to contribute a viewpoint at this session, please notify 
Mervyn Freeman <MPF@bas.ac.uk> or David Murr <david.murr@dartmouth.edu> 
with a brief description, including how much time you think you would need.

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