Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp43b..03k&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SP43B-03
Astronomy and Astrophysics
Astrophysics
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.
González Hernández Irene
Hill F. F.
Howe Rachel
Komm Rudi
Toner Clifford G.
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