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Modeling line-of-sight magnetograms of emerging active regions

Published online by Cambridge University Press:  23 December 2024

M. Poisson Open the ORCID record for M. Poisson [Opens in a new window] ,
M López–Fuentes ,
C. H. Mandrini Open the ORCID record for C. H. Mandrini [Opens in a new window] ,
F. Grings  and
P. Démoulin
M. Poisson*
Affiliation:
Instituto de Astronomía y Física del Espacio (UBA-CONICET), Buenos Aires, Argentina.
M López–Fuentes
Affiliation:
Instituto de Astronomía y Física del Espacio (UBA-CONICET), Buenos Aires, Argentina.
C. H. Mandrini
Affiliation:
Instituto de Astronomía y Física del Espacio (UBA-CONICET), Buenos Aires, Argentina.
F. Grings
Affiliation:
Instituto de Astronomía y Física del Espacio (UBA-CONICET), Buenos Aires, Argentina.
P. Démoulin
Affiliation:
Observatoire de Paris (LESIA), Meudon, France.
*
email: [email protected]
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Abstract

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Active regions (ARs) appear in the solar atmosphere as a consequence of the emergence of magnetic flux ropes (FRs). Due to the presence of twist, the photospheric line-of-sight (LOS) magnetograms of emerging ARs show an elongation of the polarities known as magnetic tongues. These tongues can affect the estimation of tilt angles during their emergence phase. In this work, we propose a Bayesian method to model LOS magnetograms of emerging ARs using a half-torus twisted FR model. We apply this model to 21 emerging ARs observed during Solar Cycle 23. We find that the Bayesian method corrects the tilt when compared to other methods, removing the spurious rotation of the polarities produced by the retraction of the tongues during the emergence. We find a variation in Joy’s law with the stage of the AR emergence and the method used for its estimation.

Keywords

Sun: magnetic fieldsSun: photospheremethods: statistical
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S365: Dynamics of Solar and Stellar Convection Zones and Atmospheres , December 2023 , pp. 326 - 331
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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