Ray-Path and Born Kernels for SDO Time-Distance Helioseismology Pipeline

Details Ray-Path and Born Kernels for SDO Time-Distance Helioseismology Pipeline Ray-Path and Born Kernels for SDO Time-Distance Helioseismology Pipeline

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640009p&link_type=abstract

American Astronomical Society, AAS Meeting #216, #400.09; Bulletin of the American Astronomical Society, Vol. 41, p.856

Computer Science

Sound

Scientific paper

We present a detailed procedure for calculating 3D sound speed and flow kernels in the ray-path and Born approximations for inversion procedures in the SDO/HMI Time-Distance Helioseismology pipeline. The total integral from the kernel is a convenient parameter which can be used for comparison of contribution of different factors (ray-path and wave approximation, spherical and Cartesian geometry). Comparison of the total integral from sound speed kernels in ray-path and Born approximation with full disk MDI observations show good agreement. For distances shorter than 25 Mm the total integrals from Born kernels are systematically lower than integrals from ray-path kernels that can be explained by contribution of wave effects. Taking into account sphericity in ray-path kernels causes a reducing the total integral of 2%.

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