Abstract Details
| Name: Lekshmi B Affiliation: IISER, Kolkata Conference ID: ASI2017_1136 Title : Testing systematics in time-distance helioseismic measurements of meridional flows using artificial data Authors and Co-Authors : 1.S.P Rajaguru,Indian Institute of Astrophysics, Bangalore 2.H.M Antia,Tata Institute of Fundamental Research, Mumbai 3.T. Hartlep,Bay Area Environmental Research Institute, NASA Ames Research Center, USA 4.J. Zhao,Hansen Experimental Physics Laboratory, Stanford University,CA,USA 5.Dibyendu Nandy,Center of Excellence in Space Sciences India,IISER, Kolkata Abstract Type : Poster Abstract Category : Sun and the Solar System Abstract : Meridional circulation (MC) in the solar convection zone plays an important role in the generation and transport of solar magnetic field. The surface component of MC,which is a flow from the equator to the poles, has been well observed using various techniques. Helioseismology has provided maps of the flows in sub surface layers. The structure and strength of the flow in deep layers obtained from helioseismic measurements is under debate. A systematic center to limb variation is present in the measured helioseismic travel times of real data, which has to be removed for accurate determination of meridional flow profile.We use Artificial data (Hartlep et al, 2012), generated by numerical simulation of helioseismic wave propagation in the whole solar interior in the presence of a prescribed meridional circulation profile for our analysis. Also, we use data sets with an artificial center to limb effect added to the above global wave field simulation data. A deep focusing time distance technique is applied on these datas for calculating the wave travel times. Further, we do inversion of the measured travel times to infer the meridional flow velocity and structure in the deep interior. We validate the center to limb correction technique using these results. |