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

Abstract

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.

21 pages, 8 figures, 5 ancillary mp4 files of subsurface flows for active regions 11158, 12673, 12882, 13006, and 13179; to appear in Dynamics of Solar and Stellar Convection Zones and Atmospheres, Proc. IAU Symp. 365, 2024