Mathematics – Logic
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999soho....8.....p&link_type=abstract
Proceeding 8th SOHO workshop, ESA SP-446 (Oct. 1999)
Mathematics
Logic
Soho, Eit, Coronal Loops
Scientific paper
3D Technics were developed to study coronal structures evolution. Anaglyphs were used to analyse the global corona, and constraints for complete stereovision reconstruction were derived in the case of EUV wavelengths. Loops morphologies were succesfully described with a torus fit which includes twist evolution. On a quick magnetic flux emergence (August 5th 1997), the loop twist is decreasing during its expansion. During a long time evolution (July - August 1996), flaring activities are well correlated with sudden twist decreases. These 2 results correspond to the evolution described by Parker's formula (1977). Magnetic field lines interactions were also analyzed. From multi-wavelengths observations, some morphological and topological changes were interpreted as interactions between open and closed magnetic field lines (ie. between Coronal Holes and Active Region Loops). Then, relationship between CME or Flares formation and our different instabilities studied were analyzed in the aim to find, in the future, good criteria concerning space weather.
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