Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh31b0715p&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SH31B-0715
Astronomy and Astrophysics
Astrophysics
7500 Solar Physics, Astrophysics, And Astronomy, 7509 Corona, 7513 Coronal Mass Ejections, 7524 Magnetic Fields, 7546 Transition Region
Scientific paper
Recent progress in 3D visualization and reconstruction made possible to follow the evolution of coronal plasma structures frozen by the magnetic field. As optically thin coronal emission lines introduce uncertainties on the reconstructions, it is needed to develop constraints on stereoscopic methods to be able to use them in the solar case. Basic geometric assumptions on structures made possible to determine the main parameters on loops - including their twists -, arcade loops structures or filament shapes, using the difference angle due to solar rotation with SOHO/EIT. Tomographic techniques are being adapted to coronagraphic data such as SOHO/LASCO. 3D analysis of flare formation on April 7th, 1997 shows emerging flux near a sigmoid loop with magnetic fields reconnection. October 13th, 1999 a twisted filament becomes instable and creates a limb CME. April 6-7th, 1998 at the limb, several ejections of twisted structures are observed. In all of these cases, the role of the helicity in these instabilities formations is analyzed. Consequences of the observed detwisting processes in ejections of material into the interplanetary space up to aurora formations are described. Then improvements expected in dynamical cases due to simultaneous observations at various angle, provided by the STEREO mission (launched in December 2004) are presented in the context of the space weather forecast.
Dal Lago Alisson
Inhester Bernd
Papadopoulo Théodore
Portier-Fozzani Fabrice
Schwenn Rainer
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