Actors of the main activity in large complex centres during the 23 solar cycle maximum

SCHMIEDER, B.; DEMOULIN P.; PARIAT E.; TOROK T. ; MOLODIJ G.; MANDRINI C.H.; DASSO S.; CHANDRA R.; UDDIN W.

ADVANCES IN SPACE RESEARCH

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2011 vol. 47 p. 2081 - 2091

0273-1177

During the maximum of Solar Cycle 23, large active regions had a long life, spanning several solar rotations, and produced largenumbers of X-class flares and CMEs, some of them associated to magnetic clouds (MCs). This is the case for the Halloween activeregions in 2003. The most geoeffective MC of the cycle (Dst = 457) had its source during the disk passage of one of these active regions(NOAA 10501) on 18 November 2003. Such an activity was presumably due to continuous emerging magnetic flux that was observedduring this passage. Moreover, the region exhibited a complex topology with multiple domains of different magnetic helicities. The complexitywas observed to reach such unprecedented levels that a detailed multi-wavelength analysis is necessary to precisely identify thesolar sources of CMEs and MCs. Magnetic clouds are identified using in situ measurements and interplanetary scintillation (IPS) data.Results from these two different sets of data are also compared.