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Subsurface Flows Associated with Formation and Flaring Activity of Solar Active Regions

Published online by Cambridge University Press:  23 December 2024

Alexander G. Kosovichev Open the ORCID record for Alexander G. Kosovichev [Opens in a new window]  and
Viacheslav M. Sadykov
Alexander G. Kosovichev*
Affiliation:
New Jersey Institute of Technology, Newark, NJ 07102, U.S.A. NASA Ames Research Center, Moffett Field, CA 95035, U.S.A.
Viacheslav M. Sadykov
Affiliation:
Physics & Astronomy Department, Georgia State University, Atlanta, GA 30303, U.S.A.
*
email: [email protected]
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Abstract

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We investigate the evolution of subsurface flows during the emergence and the active phase of sunspot regions using the time–distance helioseismology analysis of the full-disk Dopplergrams from the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory (SDO). We present an analysis of emerging active regions of various types, including delta-type active regions and regions with the reverse polarity order (‘anti-Hale active regions’). The results reveal strong vortical and shearing flows during the emergence of magnetic flux, as well as the process of formation of large-scale converging flow patterns around developing active regions, predominantly in the top 6 Mm deep layers of the convection zone. Our analysis revealed a significant correlation between the flow divergence and helicity in the active regions with their flaring activity, indicating that measuring characteristics of subsurface flows can contribute to flare forecasting.

Keywords

Sun: activitySun: helioseismologySun: magnetic fieldsSun: interiorMHD
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. 275 - 295
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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