caa a22 4500 445345829 CHVBK 20180317142828.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s11207-010-9552-1 doi (NATIONALLICENCE)springer-10.1007/s11207-010-9552-1 Subsurface Vorticity of Flaring versus Flare-Quiet Active Regions [Elektronische Daten] [R. Komm, R. Ferguson, F. Hill, G. Barnes, K. Leka] We apply discriminant analysis to 1023 active regions and their subsurface-flow parameters, such as vorticity and kinetic helicity density, with the goal of distinguishing between flaring and non-flaring active regions. We derive synoptic subsurface flows by analyzing GONG high-resolution Doppler data with ring-diagram analysis. We include magnetic-flux values in the discriminant analysis derived from NSO Kitt Peak and SOLIS synoptic maps binned to the same spatial scale as the helioseismic analysis. For each active region, we determine the flare information from GOES and include all flares within 60° central meridian distance to match the coverage of the ring-diagram analysis. The subsurface-flow characteristics improve the ability to distinguish between flaring and non-flaring active regions. For the C- and M-class flare category, the most important subsurface parameter is the so-called structure vorticity, which estimates the horizontal gradient of the horizontal-vorticity components. The no-event skill score, which measures the improvement over predicting that no events occur, reaches 0.48 for C-class flares and 0.32 for M-class flares, when the structure vorticity at three depths combined with total magnetic flux are used. The contributions come mainly from shallow layers within about 2Mm of the surface and layers deeper than about 7Mm. Springer Science+Business Media B.V., 2010 Active regions, velocity field nationallicence Helioseismology, observations nationallicence Interior, convective zone nationallicence Velocity fields, interior nationallicence Flares nationallicence Komm R. National Solar Observatory, 85719, Tucson, AZ, USA aut Ferguson R. National Solar Observatory, 85719, Tucson, AZ, USA aut Hill F. National Solar Observatory, 85719, Tucson, AZ, USA aut Barnes G. NorthWest Research Associates, Inc., CoRA, 80301, Boulder, CO, USA aut Leka K. NorthWest Research Associates, Inc., CoRA, 80301, Boulder, CO, USA aut Solar Physics Springer Netherlands 268/2(2011-02-01), 389-406 0038-0938 268:2<389 2011 268 11207 https://doi.org/10.1007/s11207-010-9552-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-010-9552-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Komm R. National Solar Observatory, 85719, Tucson, AZ, USA aut NATIONALLICENCE 700 1- Ferguson R. National Solar Observatory, 85719, Tucson, AZ, USA aut NATIONALLICENCE 700 1- Hill F. National Solar Observatory, 85719, Tucson, AZ, USA aut NATIONALLICENCE 700 1- Barnes G. NorthWest Research Associates, Inc., CoRA, 80301, Boulder, CO, USA aut NATIONALLICENCE 700 1- Leka K. NorthWest Research Associates, Inc., CoRA, 80301, Boulder, CO, USA aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 268/2(2011-02-01), 389-406 0038-0938 268:2<389 2011 268 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer