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We present an analysis of the ionic composition of iron for twointerplanetary coronal mass ejections observed in May 21-23 2007 by the ACE andSTEREO spacecraft in the context of the magnetic structure of the ejecta fluxrope, sheath region, and surrounding solar wind flow. This analysis is madepossible due to recent advances in multispacecraft data interpolation,reconstruction, and visualization as well as results from recent modeling ofionic charge states in MHD simulations of magnetic breakout and fluxcancellation CME initiation. We use these advances to interpret specificfeatures of the ICME plasma composition resulting from the magnetic topologyand evolution of the CME. We find that in both the data and our MHDsimulations, the flux ropes centers are relatively cool, while charge stateenhancements surround and trail the flux ropes. The magnetic orientation of theICMEs are suggestive of magnetic breakout-like reconnection during the eruptionprocess, which could explain the spatial location of the observed ironenhancements just outside the traditional flux rope magnetic signatures andbetween the two ICMEs. Detailed comparisons between the simulations and datawere more complicated, but a sharp increase in high iron charge states in theACE and STEREO-A data during the second flux rope corresponds well to similarfeatures in the flux cancellation results. We discuss the prospects of thisintegrated in-situ data analysis and modeling approach to advancing ourunderstanding of the unified CME-to-ICME evolution.

astrophysical journal/the astrophysical journal

Composition Structure of Interplanetary Coronal Mass Ejections From  Multispacecraft Observations, Modeling, and Comparison with Numerical  Simulations