Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2403t&link_type=abstract
American Astronomical Society Meeting 210, #24.03; Bulletin of the American Astronomical Society, Vol. 39, p.128
Astronomy and Astrophysics
Astronomy
Scientific paper
Is it the sunspot rotation that twists the magnetic fields? Or does the emergence of twisted magnetic fields create the sunspot rotation viewed in the photosphere due to a geometric effect resulting from the emergence of twisted magnetic fields? Using TRACE white light and 1600A images, BBSO/H_a and SOHO/EIT/195A observations with MDI/96m line-of-sight and HSOS vector magnetograms, we find in active region NOAA 10030 that a large positive polarity sunspot, located in the center of the region, exhibited significant counter-clockwise rotation, which continued for six days during July 12-18, 2002. This rotating sunspot was related to the formation of inverse-S-shaped filaments, left-handed twist of the vector magnetic fields, and the production of strong negative vertical current, but exhibiting little emergence of magnetic flux. All five M-class and two X-class flares were produced around this rotating sunspot over the six days period. A sunspot with negative magnetic polarity showed fast and significant emergence in the eastern portion of the active region, and moved north-eastward over several days, but exhibited no rotation. The moving sunspot also exhibited the formation of inverse-S-shaped filaments, left-handed twist of vector magnetic fields and coronal structure, and the production of stronger positive current. The observed characteristics of the emerging sunspot suggest that the significant emergence of twisted magnetic fields play an important role in coronal helicity injection and free-energy buildup, but does not have to result in a sunspot rotation viewed in the photosphere, due to a geometric effect resulting from the emergence of twisted magnetic fields. While from the observed characteristics of the strong rotating sunspot, we suggest that physical rotation of sunspots originates from the solar interior, and plays a remarkable role in coronal helicity and free-energy accumulation, but does not have to result from the geometric effect of the emergence of twisted magnetic fields.
Alexander Dave
Nightingale Richard
Tian Lirong
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