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Total solar irradiance variations: The construction of a composite and its comparison with modelsMeasurements 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 NIMBUS 7 and the factor to refer active cavity radiometer irradiation monitoring (ACRIM) 2 to the ACRIM 1 irradiance scale. With these corrections, a composite TSI is constructed with a model that combines a magnetic brightness proxy with observed sunspot darkening and explains nearly 90 percent of the observed short and long term variance. Possible, but still unverified degradation of the radiometers hampers conclusions about irradiance changes on decadal time scales and longer.
Document ID
19990056490
Acquisition Source
Headquarters
Document Type
Conference Paper
Authors
Froehlich, Claus
(Physikalisch-Meteorologisches Observatorium Davos Switzerland)
Lean, Judith
(Hulburt (E. O.) Center for Space Research Washington, DC United States)
Date Acquired
August 19, 2013
Publication Date
December 1, 1997
Publication Information
Publication: Proceedings of the 31st ESALB Symposium on Correlated Phenomena at the Sun, in the Heliosphere and in Geospace
Subject Category
Solar Physics
Distribution Limits
Public
Copyright
Other
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