Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..138i&link_type=abstract
Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July
Astronomy and Astrophysics
Astronomy
Scientific paper
We studied what is the common magnetic field configuration among flare-productive active regions. In our previous studies we have found that the magnetic neutral line shows a rotational motion in a delta-type sunspot group NOAA 9026 where three X-class flares successively occurred. In this paper we show another examples of magnetic neutral line rotations in flare-productive 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). We examined 32 active regions from 1996 through 2002 and found that the rotational sunspot motions are common to these flare-productive active regions (e.g. vortex-like motions in NOAA 8210 9236; rotation of magnetic neutral line of delta-type sunspots in NOAA 9026 9393 9415 9591 9661 0039). These motions suggest that the emergence of twisted magnetic flux bundles are the energy source for strong flares. We discuss the relation between the magnetic helicity and such a motion of magnetic neutral line e.g. the hemisphere rule of helicity sign and the orientation of neutral line rotation.
Asai Ayumi
Ishii Takako T.
Kurokawa Hiroki
Takeuchi Tsutomu T.
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