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Paper: Exploring Possible Correlation Between the Eruptivity and the Subsurface Structure of Solar Active Regions
Volume: 478, Fifty Years of Seismology of the Sun and Stars
Page: 331
Authors: Lin, C.-H.
Abstract: We investigate whether any correlation exists between the surface and coronal activity levels of active regions and their subsurface structural disturbances. The subsurface disturbances examined are δ Γ11, δ v2/v2, and δ v2/v2–δΓ11, where Γ1 is adiabatic index and v is wave speed. The relative differences are between active and quiet region pairs at the same latitude. The activity level of each active region is quantified by four indices: difference in Magnetic Activity Index between the active-quiet region pairs (dMAI), Flare Index (FI), total number of associated coronal mass ejections (Ncme), and total kinetic energy of the CMEs (KEsum). A statistical study on seventy seven active regions is conducted. The existence and level of correlations are assessed by visual inspection of scatter plots and correlation coefficient. The results indicate positive correlations between the subsurface disturbances and dMAI and KEsum. The level of correlation is stronger among the active regions with high productivity of flares and/or CMEs. FI is found to be positively correlated only with |δ v^2/v2| in the layer 0.98–0.99 R among the CME productive active regions. Little correlation is found between Ncme and any of the subsurface disturbances.
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