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			 **   THE GEM MESSENGER   **
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						     Volume 15, Number 39
						     June 14, 2005

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IM/S - Breakout: WG2 & WG3 - IM/S Assessment Challenge: Radiation Belts
Call for Participants
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From: Reiner Friedel <friedel@lanl.gov>
      Joe Fennell <Joseph.F.Fennell@aero.org>
      Sasha Ukhorskiy <aleksandr.ukhorskiy@jhuapl.edu>

This joint WG2 & WG3 Inner Magnetosphere / Storms campaign session will 
be held on Monday, 27 June from 4:00pm to 6:00pm.

Contributions are sought that address the Radiation Belt Challenge as 
defined below. While the challenge specified two GEM storms for study, 
this session is open to anyone or any event that addresses an assessment
of radiation belt model performance using in situ data. In particular 
contributions on advanced magnetic field modeling for these events are 
sought.

Anyone interested in presenting at this session is encouraged to contact
one of the conveners listed above. This session is open to CEDAR and GEM 
participants interested in the modeling of the coupled ring current/
radiation belt system, particularly during storm conditions.

Details of the IM/S Assessment Challenge can be found at:

http://csem.engin.umich.edu/GEM_IMS/

Assessment Challenge Defined (from previous GEM messenger announcement):

The challenge consists of  five interlinked parts, applied to two storm
periods:

1.) Provide the highest possible fidelity in-situ data for relativistic
electrons in the inner magnetosphere. The correct "map" for these 
measurements is produced in point 2.).

2.) Provide the best possible dynamic magnetic field model:
        a) Using the PSD matching technique developed at LANL
        b) Using the T89 modifications developed at FMI or elsewhere
        c) MHD code models
        d) Other
	
3.) Perform model runs for the selected storms. These runs may produce 
their own global magnetic field or use the provided dynamic fields. 
Anticipated models that will be used:
         a)  UNH-RAM code, Vania Jordanova

b) Mei Ching Fok's ring current model

c) Margaret Chen's model

d) Salammbo pure

e) Salammbo data assimilation mode

4.) Comparison of particle data between model and data, using the 
magnetic field coordinate mappings using the best dynamic fields of 2.).

5.) Comparison of model-produced magnetic fields with fields of point 2.) .

Two storm periods have been selected for this challenge:

October 21-23, 2001
September 4-9,  2002

The October 21-23, 2001 has been chosen since it is already being used 
for the ring current challenge. The September 4-9,  2002 storm has been 
chosen for the existence of geosynchronous pitch angle data and because 
it is not an extreme event.

A web site has been established for the interchange of data related to 
this challenge:

http://csem.engin.umich.edu/GEM_IMS/IMSAC_RBdetails.html

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