Filament eruption, solar flares on 18 November 2003 and associated magnetic cloud of 20 November 2003

CHANDRA, R.; SCHMIEDER, B.; MANDRINI, C.H.; PARIAT, E.

Bournemouth

Workshop; STEREO3/SOHO22 Workshop: Three eyes on the Sun - Multi-spacecraft studies of the corona and impacts on the heliosphere; 2009

The eruption of a portion of a long sigmoidal filament in AR 10501, CMP November 18, is   believed  to be the source region of the halo CME that was observed travelling  at  a velocity of 1650 km/s in LASCO white light images. The global magnetic helicity of AR 10501, as well as the chirality of most of the filament is negative. However, the magnetic cloud of November 20, 2003,  associated with the CME of  November 18, 2003,  has a positive helicity.  Our detailed analysis of the 2D magnetic helicity flux maps of the AR  shows that the southern section of the AR is the site of a flux of positive helicity progressively built for days. We propose that it is the southern portion of the filament, lying along the inversion line,where the positive helicity injection occurs, the flux rope that is  observed later as a MC  in the interplanetary medium.