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Solar Cycle Modulation of Total Irradiance: an Empirical Model from 1874 to 1988Evidence acquired during the past decade indicates that over time scales of the solar cycle, enhanced emission from bright solar faculae cause significant variations in the sun's total irradiance even though, on shorter time scales, the most pronounced variations are those resulting from the passage of dark sunspots across the solar disc. An empirical model which accounts for the competing effects of dark sunspots and bright faculae has been developed from the available radiometry in cycle 21, and extended back to the beginning of solar cycle 12. According to this model, the largest 11-year modulation of total irradiance during the C20th occurred in the most recent cycle 21.
Document ID
19910003171
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Lean, J. (Naval Research Lab. Washington, DC., United States)
Foukal, P. (Cambridge Research and Instrumentation Inc., MA., United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1990
Publication Information
Publication: NASA, Goddard Space Flight Center, Climate Impact of Solar Variability
Subject Category
Solar Physics
Accession Number
91N12484
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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