Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..693i&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Astronomy and Astrophysics
Astronomy
Scientific paper
We studied what is the key process to trigger the major solar flares using observational data of the evolutions of active regions. In our previous studies we have pointed out that the process of magnetic shear development is important for studying the above topic. We have constructed schematic models of emerging magnetic flux bundles to explain observed sunspot proper motions and found that the emergence of twisted magnetic flux bundles relates to strong flare activities in several sunspot groups. During the current solar maximum (cycle 23) we studied the evolution of all the active regions that have produced at least one X-class flare and have been observed by the Solar and Heliospheric Observatory (SOHO) / Michelson Doppler Imager (MDI). In this paper we analyzed 32 active regions from 1996 through 2002 and studied what is the the common magnetic field configuration among these active regions. We found that the above-mentioned relation between sunspot proper motions resulting from the emergence of twisted magnetic flux tubes and strong flare activities are common among flare-productive active regions. This result suggests that the emergence of twisted magnetic flux bundles are the energy source for strong flares.
Ishii Takaaki
Kurokawa Hiroki
Takeuchi Tadashi
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