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Exploring the Quenching of Bipolar Magnetic Region Tilts using AutoTAB

Published online by Cambridge University Press:  23 December 2024

Bibhuti Kumar Jha ,
Anu B. Sreedevi Open the ORCID record for Anu B. Sreedevi [Opens in a new window] ,
Bidya Binay Karak  and
Dipankar Banerjee Open the ORCID record for Dipankar Banerjee [Opens in a new window]
Bibhuti Kumar Jha
Affiliation:
Southwest Research Institute, Boulder 80302, USA
Anu B. Sreedevi
Affiliation:
Department of Physics, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, India
Bidya Binay Karak
Affiliation:
Department of Physics, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, India
Dipankar Banerjee
Affiliation:
Aryabhatta Research Institute of Observational Sciences, Nainital 263002, Uttarakhand, India
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Abstract

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The tilt of the bipolar magnetic region (BMR) is crucial in the Babcock-Leighton process for the generation of the poloidal magnetic field in the Sun. We extend the work of Jha et al. (2020) and analyze the recently reported tracked BMR catalogue based on AutoTAB (Sreedevi et al. 2023) from Michelson Doppler Imager (1996–2011) and Helioseismic and Magnetic Imager (2010–2018). Using the tracked information of BMRs based on AutoTAB, we confirm that the distribution of Bmax reported by Jha et al. (2020) is not because of the BMRs are picked multiple times at the different phases of their evolution instead it is also present if we consider each BMRs only once. Moreover, we find that the slope of Joy’s law (〈γ0〉) initially increases slowly with the increase of Bmax. However, when Bmax >2.5 kG, γ0 decreases. The decrease of observed γ0 with Bmax provides a hint to a nonlinear tilt quenching in the Babcock-Leighton process.

Keywords

SunBipolar Magnetic RegionsSolar Dynamo
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. 345 - 349
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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