Computer Science – Sound
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1602c&link_type=abstract
American Astronomical Society, SPD meeting #42, #16.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Computer Science
Sound
Scientific paper
In local helioseismology, inversion methods that can separate magnetic and thermal perturbations are needed, especially for probing the subsurface structure of sunspots. We present a method for performing linear helioseismic inversions that can infer small-amplitude perturbations to both the magnetic field strength and the sound-speed profile in translation-invariant background models permeated by a 3 kG vertical magnetic field, consistent with expectations for sunspot umbrae. We introduce a novel inversion routine that consists of two parts: first; a traditional regularized least squares inversion is utilized to search regularization-parameter space for inversion coefficients and second; an analysis of these inversion coefficients identifies the sets of coefficients that have the required attributes for a pair of inferred sound-speed and magnetic fields models. We show a case study in which this inversion method is able to accurately recover a sound-speed perturbation and a perturbation in the magnetic field strength simultaneously. We will discuss how these results relate to the local helioseismology of sunspots. This work is supported by NASA contracts NNH09CE41C and NNG07EI51C.
Birch Aaron C.
Braun Doug C.
Clack Christopher
Crouch Ashley D.
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