Stray-light correction in magnetograph observations using the maximum entropy method

Document Type

Article

Publication Date

1-1-1998

Abstract

We have developed a method of stray-light correction which is applicable to filter-based magnetograph observations. Stray-light-corrected Stokes images are obtained by performing the deconvolution of observed Stokes images by the point spread function which is determined from the Stokes I image. For image deconvolution, the maximum entropy principle is used to guarantee that intensity should be positive and polarization degrees should be less than unity. We present an iterative algorithm for the maximum entropy method, which seeks the solution in Fourier space and thus accomplishes fast convergence. We find that our method is effective in correcting stray light which has a spread angle greater than the full width at half maximum of the point spread function. We also discuss the effect of stray light on magnetograph calibration.

Identifier

0041724208 (Scopus)

Publication Title

Solar Physics

External Full Text Location

https://doi.org/10.1023/A:1005089307639

ISSN

00380938

First Page

245

Last Page

261

Issue

2

Volume

183

Grant

966–0203–005–2

Fund Ref

National Science Foundation

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