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Study of helicity properties of peculiar active regions

Published online by Cambridge University Press:  26 February 2010

M. C. López Fuentes ,
C. H. Mandrini  and
P. Démoulin
M. C. López Fuentes
Affiliation:
Instituto de Astronomía y Física del Espacio (CONICET-UBA), CC 67, Suc 28, 1428 Buenos Aires, Argentina e-mail: [email protected]
C. H. Mandrini
Affiliation:
Instituto de Astronomía y Física del Espacio (CONICET-UBA), CC 67, Suc 28, 1428 Buenos Aires, Argentina e-mail: [email protected]
P. Démoulin
Affiliation:
Observatoire de Paris, LESIA, UMR 8109 (CNRS), F-92195, Meudon Principal Cedex, France
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Abstract

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Peculiar solar active regions (ARs), such as δ-islands and other high tilt bipoles, are commonly associated with the emergence of severely deformed magnetic flux tubes. Therefore, the study of these ARs provides valuable information on the origin and evolution of magnetic structures in the solar interior. Here, we infer the magnetic helicity properties of the flux tubes associated to a set of peculiar ARs by studying the evolution of photospheric magnetograms (SOHO/MDI) and coronal observations (SOHO/EIT and TRACE) in combination with force-free models of the magnetic field. We discuss how our results relate to different models of the evolution of emerging magnetic flux tubes.

Keywords

Sun: magnetic fieldsSun: activitySun: photosphereSun: corona
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S264: Solar and Stellar Variability: Impact on Earth and Planets , August 2009 , pp. 102 - 104
Copyright
Copyright © International Astronomical Union 2010

References

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