Tracing the 3-D coronal structure during CMEs with STEREO/SECCHI EUVI observations

Physics

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7509 Corona, 7513 Coronal Mass Ejections (2101), 7549 Ultraviolet Emissions

Scientific paper

STEREO/SECCHI EUVI observations of solar coronal loops, filaments, and dimming regions provide unique information on the 3-D topology of the coronal magnetic field above active regions and its evolution during coronal mass ejections (CMEs). Active Region #10956 produced several CMEs during its passage across the solar disk in May 2007, some of them showing filament eruptions and dimming. The SECCHI/EUVI instrument on STEREO obtained high cadence observations in multiple lines simultaneously from both STEREO spacecraft. 3-D reconstructions of coronal features over the course of a CME show significant changes of the field topology. Comparisons with the potential field topology from magnetic field extrapolations show the degree of non-potentiality of the real field and changes in the vicinity of the CME onset. We present initial results of this study.

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