Statistics – Computation
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.517...23l&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
4
Local Helioseismology, Helioseismic Holography
Scientific paper
A major obstacle that encumbers local seismic diagnostics of the shallow subphotospheres of strong active regions is phase errors introduced by overlying surface magnetic fields. These errors function as a sort of "acoustic showerglass" that obscures subphotospheric acoustic anomalies, scrambling computational images of these derived by phase-coherent seismic reconstruction. We develop a proxy based on the surface magnetic field to correct the showerglass phase errors and image acoustic scatterers beneath it. Preliminary applications of this correction give us signatures that appear to signify strong, sharply outlined acoustic anomalies 3-9 Mm beneath large growing active regions. Correction of the showerglass correction appears to be important, if not essential, for diffraction-limited diagnostics of acoustic anomalies in the shallow subphotospheres of strong active regions.
Braun Doug C.
Lindsey Charles
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