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Title:
Solar Irradiance Models and Measurements: A Comparison in the 220-240 nm wavelength band
Authors:
Unruh, Yvonne C.; Ball, Will T.; Krivova, Natalie A.
Affiliation:
AA(Astrophysics Group, Blackett Laboratory, Imperial College London), AB(Astrophysics Group, Blackett Laboratory, Imperial College London), AC(Max-Planck Institut für Sonnensystemforschung)
Publication:
Surveys in Geophysics, Volume 33, Issue 3-4, pp. 475-481
Publication Date:
07/2012
Origin:
SPRINGER
Keywords:
Sun: activity, Sun: irradiance, Spectral And Total Irradiance REconstructions (SATIRE), SOlar Radiation and Climate Experiment (SORCE), Upper Atmosphere Research Satellite/Solar Ultraviolet Spectral Irradiance Monitor (UARS/SUSIM)
Abstract Copyright:
(c) 2012: Springer Science+Business Media B.V.
DOI:
10.1007/s10712-011-9166-7
Bibliographic Code:
2012SGeo...33..475U

Abstract

Solar irradiance models that assume solar irradiance variations to be due to changes in the solar surface magnetic flux have been successfully used to reconstruct total solar irradiance on rotational as well as cyclical and secular time scales. Modelling spectral solar irradiance is not yet as advanced, and also suffers from a lack of comparison data, in particular on solar cycle time scales. Here, we compare solar irradiance in the 220-240 nm band as modelled with SATIRE-S and measured by different instruments on the UARS and SORCE satellites. We find good agreement between the model and measurements on rotational time scales. The long-term trends, however, show significant differences. Both SORCE instruments, in particular, show a much steeper gradient over the decaying part of cycle 23 than the modelled irradiance or that measured by UARS/SUSIM.
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