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On 2012 August 2, two CMEs (CME-1 and CME-2) erupted from the west limb ofthe Sun as viewed from Earth, and were observed in images from the white lightcoronagraphs on the SOHO and STEREO spacecraft. These events were also observedby the Very Large Array (VLA), which was monitoring the Sun at radiowavelengths, allowing time-dependent Faraday rotation observations to be madeof both events. We use the white-light imaging and radio data to model the 3-Dfield geometry of both CMEs, assuming a magnetic flux rope geometry. For CME-2,we also consider 1 au in situ field measurements in the analysis, as this CMEhits STEREO-A on August~6, making this the first CME with observationalconstraints from stereoscopic coronal imaging, radio Faraday rotation, and insitu plasma measurements combined. The imaging and in situ observations ofCME-2 provide two clear predictions for the radio data; namely that VLA shouldobserve positive rotation measures (RMs) when the radio line of sight firstencounters the CME, and that the sign should reverse to negative within acouple hours. The initial positive RMs are in fact observed. The expected signreversal is not, but the VLA data unfortunately end too soon to be sure of thesignificance of this discrepancy. We interpret an RM increase prior to theexpected occultation time of the CME as a signature of a sheath region ofdeflected field ahead of the CME itself.

Inferences About the Magnetic Field Structure of a CME with Both In Situ and Faraday Rotation Constraints