J/A+A/579/A3 Spatial deconvolution code (Quintero Noda+, 2015)
Spatial deconvolution of spectropolarimetric data: an application to quiet Sun
magnetic elements.
Quintero Noda C., Asensio Ramos A., Orozco Suarez D., Ruiz Cobo B.
<Astron. Astrophys. 579, A3 (2015)>
=2015A&A...579A...3Q 2015A&A...579A...3Q
ADC_Keywords: Sun ; Models
Keywords: methods: statistical - methods: data analysis -
techniques: polarimetric - techniques: spectroscopic -
Sun: photosphere - Sun: magnetic fields
Abstract:
One of the difficulties in extracting reliable information about the
thermodynamical and magnetic properties of solar plasmas from
spectropolarimetric observations is the presence of light dispersed
inside the instruments, known as stray light.
We aim to analyze quiet Sun observations after the spatial
deconvolution of the data. We examine the validity of the
deconvolution process with noisy data as we analyze the physical
properties of quiet Sun magnetic elements.
We used a regularization method that decouples the Stokes inversion
from the deconvolution process, so that large maps can be quickly
inverted without much additional computational burden. We applied the
method on Hinode quiet Sun spectropolarimetric data. We examined the
spatial and polarimetric properties of the deconvolved profiles,
comparing them with the original data. After that, we inverted the
Stokes profiles using the Stokes Inversion based on Response functions
(SIR) code, which allow us to obtain the optical depth dependence of
the atmospheric physical parameters.
Description:
This deconvolution method follows the scheme presented in Ruiz Cobo &
Asensio Ramos (2013A&A...549L...4R 2013A&A...549L...4R) The Stokes parameters are
projected onto a few spectral eigenvectors and the ensuing maps of
coefficients are deconvolved using a standard Lucy-Richardson
algorithm. This introduces a stabilization because the PCA filtering
reduces the amount of noise.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
pca.zip 512 17 IDL code
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Acknowledgements:
Carlos Quintero Noda, cqn(at)iac.es
(End) Patricia Vannier [CDS] 15-May-2015