Analysis of the Magnetic Field Structure of a CME with Both In-Situ and Faraday Rotation Constraints
Abstract
Using imaging data from STEREO and SOHO/LASCO, empirical 3D reconstructions of the kinematics and morphology of two CMEs from 2012 August 2 have been performed, events of particular interest due to the existence of observational constraints from the Very Large Array (VLA). The VLA data provide Faraday rotation measurements for the CMEs, which constrain the CME magnetic field and its orientation. Furthermore, one of the two CMEs ultimately hit STEREO-A on 2012 August 6. This is the first CME with constraints from stereoscopic imaging, radio Faraday rotation, and in-situ plasma measurements, so the event is ideal for exploring CME field structure. The imaging and in-situ data make it very clear that the VLA data should see positive rotation measures when the observed radio line of sight first encounters the CME, which is in fact what is observed. Thus, the imaging, radio, and in-situ data pass this crucial first test of consistency.
- Publication:
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Solar Heliospheric and INterplanetary Environment (SHINE 2019)
- Pub Date:
- May 2019
- Bibcode:
- 2019shin.confE..47W