Kinetic Helicity in Solar Subsurface Layers and Flare Activity of Active Regions

Astronomy and Astrophysics – Astrophysics

Scientific paper

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7500 Solar Physics, Astrophysics, And Astronomy, 7519 Flares, 7522 Helioseismology

Scientific paper

We search for a relation between subsurface flows below active regions and flare events occuring in those regions. For this purpose, we use a ring-diagram analysis to determine the subsurface flows from high-resolution Global Oscillation Network Group (GONG) and Michelson Doppler Imager (MDI) data and derive the kinetic helicity as a measure of the topology of the subsurface flows. We compare it with X-ray flare data from Geostationary Operational Environmental Satellite (GOES). We study active regions in three Carrington rotations (CR~1982, 1988, and 2009), which represent different levels of flare activity. The maximum value of the unsigned kinetic helicity density associated with each active region correlates remarkably well with the total flare X-ray intensity of the active regions; active regions with strong flare activity show large values of kinetic helicity density in subsurface flows. This work has ben supported by NASA grant NAG 5-11703.

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