Three-dimensional Coronal Mass Ejection Structure and Dynamics from Stereoscopic Polarimetric Observations

Details Three-dimensional Coronal Mass Ejection Structure and Dynamics from Stereoscopic Polarimetric Observations Three-dimensional Coronal Mass Ejection Structure and Dynamics from Stereoscopic Polarimetric Observations

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh32a0780m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH32A-0780

Physics

2101 Coronal Mass Ejections (7513), 2111 Ejecta, Driver Gases, And Magnetic Clouds

Scientific paper

We present a study of the three-dimensional structure of coronal mass ejections (CMEs) from polarimetric observations made by the SOHO/LASCO and STEREO/SECCHI coronagraphs. The polarimetric reconstruction technique alone can provide mean line-of-sight distance from the plane of the sky at multiple positions in CMEs. In the case of filamentary structures this provides accurate three-dimensional positions. We argue that in the later stage of halo CMEs this technique provides accurate reconstruction of the lower portion of the eruption. We also use the polarimetric technique to test the results provided by purely stereoscopic analysis, and use both types of information in combination to infer the maximum structural detail possible, without assuming a CME model. We compare our results with a dynamical, magnetohydrodynamic CME model based on the eruption of a magnetic flux loop arcade. This model solves the equations of motion of multiple high-aspect ratio twisted flux loops, which are driven by diamagnetic, gravitational and drag forces. Forces from adjacent loops result in collective effects which partially determine the CME shape. The model can reproduce total brightness and polarimetric observations of both limb and halo CMEs.

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