Simultaneous Multipoint Observations of Stormtime Substorms with
the CLUSTER, IMAGE, POLAR, Geosynchronous, and GPS Spacecraft

M. G. Henderson, R. H. W. Friedel, R. M. Skoug, G. D. Reeves, J.-M. Jahn,
J. Ingraham, T. E. Cayton, M. F. Thomsen


Geomagnetic storms represent one of the most spectacular and disruptive
manifestations of enhanced energy flow from the solar wind to the near
Earth space environment that we know of. And, one of the longest standing
unresolved problems in storm research has been the determination of the 
role that individual substorms play in this process. In large part, the 
slow progress in resolving this question stems from our inability to 
adequately separate the spatial and temporal effects of the 
magnetospheric processes associated with storms. However, we now have a 
sizeable constellation of spacecraft operating in the magnetosphere with 
in-situ and/or global imaging capabilities including: CLUSTER 
(4 spacecraft), POLAR, IMAGE, Geosynchronous (6-8 spacecraft), and GPS
(several spacecraft). We present detailed analyses of several events
observed during the Summer/Fall of 2001 when the CLUSTER apogee was 
situated in the nightside tail. In particular, we focus on the global 
behavior of recurrent "embedded" substorms (including those associated 
with "sawtooth" injections).

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To be presented at the 2002 Spring A.G.U. Meeting, 
Washington, D.C., U.S.A., 28-31 May 2002