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

SCHMIEDER, B.; CHANDRA, R.; DÉMOULIN, P.; MANDRINI, C.H.; VENKATAKRISHNAN, P.; MANOHARAN, P.K.; UDDIN, W.; PARIAT, E.; TOROK, T.; MOLODIJ, G.; KUMAR, P.

Bremen

Congreso; 38th COSPAR Scientific Assembly; 2010

Committee on Space Research

During the maximum of the last Solar Cycle solar cycle 23, large active regions had a long life spanning several solar rotations and produced a large number of X-ray class flares, CMEs and Magnetic clouds (MC). This was the case for the Halloween active regions in 2003. The most geoeffective magnetic cloud of the cycle (Dst=-457) has its source in one passage of the active region (NOAA 10501) on November 18, 2003. Such an activity is presumably due to continuous emerging magnetic flux that was observed during this passage. Moreover, the region exhibited a complex topology with multiple domains of distinct magnetic helicities. The complexity is observed to reach such unprecedented levels that a detailed multi wavelength analysis is necessary to precisely identify the sources of CMEs and MCs.