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Total Solar Irradiance Variations: The Construction of a Composite and its Comparison with Models

Published online by Cambridge University Press:  08 February 2017

Claus Fröhlich  and
Judith Lean
Claus Fröhlich
Affiliation:
Physikalisch-Meteorologisches Observatorium Davos, World Radiation Center, CH-7260 Davos Dorf Switzerland
Judith Lean
Affiliation:
E.O. Hulburt Center for Space Research, Naval Research Laboratory, Washington, D.C.20375-5320, U.S.A.

Abstract

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Measurements of the total solar irradiance (TSI) during the last 18 years from spacecraft are reviewed. Corrections are determined for the early measurements made by the HF radiometer within the ERB experiment on NIMBUS7 and the factor to refer ACRIM II to the ACRIM I irradiance scale. With these corrections a composite TSI is constructed for the period from 1978-1997. This time series is compared with a model that combines a magnetic brightness proxy with observed sunspot darkening and explains nearly 90% of the observed short and longterm variance. Possible, but still unverified degradation of the radiometers hampers conclusions about irradiance changes on decadal time scales and longer.

Type
II. Solar Convection and Variation of Irradiance
Information
Symposium - International Astronomical Union , Volume 185: New Eyes to See Inside the Sun and Stars , 1998 , pp. 89 - 102
Copyright
Copyright © Kluwer 1998 

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