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Evolution of a very complex active region during the decay phase of Cycle 23

Published online by Cambridge University Press:  05 July 2012

Mariano Poisson ,
Marcelo López Fuentes ,
Cristina H. Mandrini ,
Pascal Démoulin  and
Etienne Pariat
Mariano Poisson
Affiliation:
Instituto de Astronomía y Física del Espacio (CONICET-UBA), CC 67 Suc 28, 1428 Buenos Aires, Argentina Facultad de Ciencias Exactas y Naturales, UBA, Buenos Aires, Argentina
Marcelo López Fuentes
Affiliation:
Instituto de Astronomía y Física del Espacio (CONICET-UBA), CC 67 Suc 28, 1428 Buenos Aires, Argentina Facultad de Ciencias Exactas y Naturales, UBA, Buenos Aires, Argentina
Cristina H. Mandrini
Affiliation:
Instituto de Astronomía y Física del Espacio (CONICET-UBA), CC 67 Suc 28, 1428 Buenos Aires, Argentina Facultad de Ciencias Exactas y Naturales, UBA, Buenos Aires, Argentina
Pascal Démoulin
Affiliation:
Observatoire de Paris, LESIA, 92195 Meudon, France
Etienne Pariat
Affiliation:
Observatoire de Paris, LESIA, 92195 Meudon, France
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Abstract

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We study the emergence and evolution of AR NOAA 10314, observed on the solar disk during March 13-19, 2003. This extremely complex AR is of particular interest due to its unusual magnetic flux distribution and the clear rotation of the polarities of a δ-spot within the AR. Using SOHO/MDI magnetograms we follow the evolution of the photospheric magnetic flux to infer the morphology of the structure that originates the AR. We determine the tilt angle variation for the δ-spot and find a counter-clockwise rotation corresponding to a positive writhed flux tube. We compute the magnetic helicity injection and the total accumulated helicity in the AR and find a correlation with the observed rotation.

Keywords

Sun: photosphereSun: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S286: Comparative Magnetic Minima: Characterizing quiet times in the Sun and Stars , October 2011 , pp. 246 - 249
Copyright
Copyright © International Astronomical Union 2012

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