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Title: Comparison between KPVT/SPM and SoHO/MDI magnetograms with an application to solar irradiance reconstructions
Authors : Wenzler, T.
Solanki, S. K.
Krivova, N. A.
Fluri, D. M.
Published in : Astronomy & Astrophysics
Volume(Issue) : 427
Issue : 3
Pages : 1031
Pages to: 1043
Publisher / Ed. Institution : EDP Sciences
Issue Date: 2004
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (publication)
Language : English
Subjects : Sun: activity; Methods: data analysis; Sun: solar-terrestrial relations; Sun: faculae, plages
Subject (DDC) : 500: Natural sciences and mathematics
Abstract: To be able to use both space- and ground-based solar magnetograms and construct long time series of derived parameters it is important to cross-calibrate them so that we can estimate their reliability and combine them. Using two different techniques, we compare magnetograms as well as continuum images recorded by the Spectropolarimeter (SPM) on Kitt Peak and the Michelson Doppler Interferometer (MDI) on board SoHO.We find that the result obtained depends on the method used. The method we favour gives almost identical umbral and penumbral areas and very similar total magnetic fluxes in faculae. The magnetic fluxes in umbrae and penumbrae returned by the two instruments, however, differ considerably. We also demonstrate that SPM data can be employed to reconstruct total solar irradiance variations with almost the same accuracy as recently shown for MDI data.
Further description : All A&A articles are in open access one year after their publication date (August 2013).
Departement: School of Engineering
Publication type: Article in scientific journal
DOI : 10.21256/zhaw-4710
ISSN: 0004-6361
Appears in Collections:Publikationen School of Engineering

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