Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sf2a.conf..543a&link_type=abstract
"SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel, F. Combes
Astronomy and Astrophysics
Astrophysics
Scientific paper
Simple laws have long-since been put forward from the chirality of observed features to derive the direction of the axial magnetic field inside solar filaments. These are the so-called ``filament chirality rules''. Here, we report on two uses of these rules applied to THEMIS and SVST observations and to MHD simulations. Being the first to apply these rules to the 180° disambiguation of the direction of the photospheric transverse magnetic field around filaments, we found the unprecedented evidence of magnetic support in filament feet, as predicted by former magnetostatic and recent MHD models. By combining these rules with 3D weakly twisted flux tube models, we identified the sign of the magnetic helicity in several filaments. Following their interactions with one another over a few days, we found that the observational condition for two filaments to merge is that their flux tubes must have the same helicity sign. We theoretically recovered these results, by conducting a parametric study of 3D numerical MHD simulations of sheared bipoles. This study also provided new conditions for filament merging, in yet-unobserved configurations in which sheared bipoles are oppositely oriented.
Aulanier Guillaume
Schmieder Brigitte
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