HR: 1330h
AN: SP43B-04    [Abstracts]
TI: Vorticity and Kinetic Helicity in Solar Subsurface Layers from GONG and MDI data
AU: * Komm, R
EM: rkomm@nso.edu
AF: National Solar Observatory, 950 N. Cherry Ave, Tucson, AZ 85719
AU: Howe, R
EM: rhowe@nso.edu
AF: National Solar Observatory, 950 N. Cherry Ave, Tucson, AZ 85719
AU: Hill, F
EM: fhill@nso.edu
AF: National Solar Observatory, 950 N. Cherry Ave, Tucson, AZ 85719
AU: Haber, D A
EM: dhaber@solarz.colorado.edu
AF: JILA, University of Colorado, UCB 440, Boulder, CO 80309
AU: González Hernández, I
EM: irenegh@nso.edu
AF: National Solar Observatory, 950 N. Cherry Ave, Tucson, AZ 85719
AB: 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 vorticity and the kinetic helicity of the subsurface flows in the upper 16~Mm of the convection zone. We separate the contributions of large-scale horizontal flows, such as differential rotation, from those of small-scale variations, such as the ones due to active regions, and analyze the large-scale and the residual component independently. We study the relation between magnetic activity and subsurface flows by comparing synoptic maps of the derived residual quantities with maps of photospheric magnetic activity. By comparing synoptic maps derived from GONG and MDI data, we are able to cross-validate the results. We will present the latest findings. This work has been supported by NASA and NSF.
DE: 7500 SOLAR PHYSICS, ASTROPHYSICS, AND ASTRONOMY
DE: 7522 Helioseismology
DE: 7524 Magnetic fields
SC: Solar Physics Division - AAS [SP]
MN: 2005 Joint Assembly