GEM Tail/Substorm Working Group #2 Summer Workshop Agenda
		and General Solicitation for Participation

On behalf of Working Group #2 of the GEM Tail/Substorm Campaign, the co-chairs, 
Terry Onsager (onsager@unhesp.unh.edu) and Harlan Spence (spence@bu.edu),
solicit your participation in the GEM summer workshop in Snowmass.  Please
review the working group activities listed below and, should you have a specific
aspect of these topics that you wish to present during the sessions, please
contact either one of the co-chairs prior to the meeting.  As in past meetings,
we wish that our sessions emphasize a truly workshop atmosphere with a 
relatively fluid agenda and ample opportunity for discussion and 
audience participation.  

For those not attending the meeting, please periodically check the GEM
WWW homepage where you will be able to find a summary of the meeting activities
as well as a "Virtual" GEM Poster session (http://www-ssc.igpp.ucla.edu/gem/).
We are looking forward to your participation!  

	See you in Colorado,  Terry and Harlan

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   Working Group #2:  Substorm/Tail Phenomenology - Observations and Models
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	Thursday, June 29; 10:30 - 12:00

Model Predictions and Tests / Model Comparisons with Data - 
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	In this session we are specifically seeking modellers with tail and
substorm models to address the following sorts of issues:

	(1) identifying which aspects of their models are predictions 
		that can be tested uniquely;
	(2) identifying an observation or set of specific observations that
		would be required to verify a prediction; 
	(3) identifying which aspects are merely reflections of an input or
		model constraint and as such is only confirmatory of that 
		which is known or specified;
	(4) presenting tangible examples of such comparison of models with data.

	We envision participation ranging from quasi-static global magnetotail
models to local microsphysical models that describe or predict behavior
about the all phases of magnetotail evolution (quasi-static to inherently 
dynamic), from the deep-tail to the inner edge/near-geostationary regions.
These might include:  the Rice Convection model, the finite tail-width
convection model, global or synoptic MHD models, particle codes, empirical
magnetic and particle models, etc.

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	Thursday, June 29; 1:30 - 3:00

Scale-Interactive Processes - 
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	Owing to significant overlap between WG #2 and WG #3's interest in 
these topics, WG #2 will meet jointly with the Quantitative Tail and Substorm
Models Working Group #3 during this session.  This session will be led
by WG#3 co-chairs Michael Hesse and Bill Lotko.  At this time, discussions
will focus on two main topics: Current Disruption - led by Tony Lui and
Generalized MHD and Multiple Scales led by Amitava Bhattacharjee.  We hope
that the joint meeting of WGs will allow WG #2 members to participate 
actively in these areas and cross-fertilize with WG #3.

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	Friday, June 30; 10:35 - 12:00

Present and Future Contributions of GEM to GGS/STEP/IACG and other Programs - 
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	In this session, we are specifically seeking not only discussion but
also tangible evidence of coordinated scientific cooperation between the 
various geospace programs that are ongoing, upcoming, and planned. We will have 
GGS representatives, both in the form of GGS project officials and in the 
form of GGS PIs who are also active members of the GEM program, as vital 
participants of this session.  Our program will consist of:

	(1) a brief overview of the GGS, GEM, and other programs with a specific
		focus on areas of common scientific interest and 
		complementarity of technique;
	(2) a summary of the recent ISTP Hawaii meeting dealing with 
		joint Geotail/Wind scientific studies;
	(3) a short discussion of any operational issues and coordination of 
		effort that might be particularly critical to the many NSF-
		sponsored ground instruments;
	(4) and finally, and probably most importantly, identifying intervals 
		and commencing real tasks that bring to bear the 
		capabilities developed within the GEM community as a complement
		to other programs.

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	Friday, June 30; 1:45 - 3:15

Substorm Triggers:  Theoretical Predictions and Observational Constraints
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	In this session, we will be discussing one of the central issues of
substorm physics - identification of the mechanism(s) which trigger substorm
onset.  We hope that this session will focus not only on the several different 
theoretical models that treat the various aspects of triggers but also on the
data (ground-based, low-altitude, near-Earth, and deep tail) that constrain the
timing and location of substorm onset.

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