Helioseismic imaging of the farside and the interior

Details Helioseismic imaging of the farside and the interior Helioseismic imaging of the farside and the interior

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.517...15b&link_type=abstract

In: Proceedings of SOHO 12 / GONG+ 2002. Local and global helioseismology: the present and future, 27 October - 1 November 2002,

Statistics

Computation

7

Local Helioseismology, Holography, Active Regions, Supergranulation, Farside

Scientific paper

Helioseismic holography is a highly efficient and flexible procedure with a wide range of utility, from mapping sound wave travel times over the entire far solar hemisphere to imaging small scale scatterers and flows beneath solar active regions. Seismic images covering the entire far hemisphere of the Sun have been constructed using data from the recently upgraded Global Oscillation Network Group (GONG+) network and compare favorably with those made using simultaneous data from the Michelson Doppler Imager (MDI) onboard the Solar and Heliospheric Observer (SOHO). We are also continuing our comprehensive exploration of diffraction-limited seismic imaging of active regions. We have recently extended our applications of helioseismic holography to include Doppler diagnostics of active regions and quiet Sun. A major finding presented here is that the horizontal velocity field in supergranules and sunspot moats appears to be concentrated at the surface. Another recent, but vital, contribution to local helioseismology has been a study of what is termed the "showerglass effect". Magnetic fields in the photosphere produce large, local amplitude and phase perturbations to the observed acoustic wave field which may be quantified and removed prior to the holographic computations. Removal of the showerglass from local helioseismic images of active regions is proving to be a crucial step in the detection of compact subsurface scatterers.

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