Observations of solar irradiance variability

Details Observations of solar irradiance variability Observations of solar irradiance variability

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981sci...211..700w&link_type=abstract

Science, vol. 211, Feb. 13, 1981, p. 700-702.

Physics

223

Irradiance, Satellite-Borne Instruments, Solar Instruments, Solar Maximum Mission, Correlation, Power Spectra, Sunspots, Time Response

Scientific paper

High-precision measurements of total solar irradiance, made by the active cavity radiometer irradiance monitor on the Solar Maximum Mission satellite, show the irradiance to have been variable throughout the first 153 days of observations. The corrected data resolve orbit-to-orbit variations with uncertainties as small as 0.01%. Irradiance fluctuations are typical of a band-limited noise spectrum with high-frequency cutoff near 0.15/day; their amplitudes about the mean value of 1368.31 watts per square meter approach plus or minus 0.05%. Two large decreases in irradiance of up to 0.2% lasting about one week are highly correlated with the development of sunspot groups. The magnitude and time scale of the irradiance variability suggest that considerable energy storage occurs within the convection zone in solar active regions.

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