Spectrum line intensity as a surrogate for solar irradiance variations

Details Spectrum line intensity as a surrogate for solar irradiance variations Spectrum line intensity as a surrogate for solar irradiance variations

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988sci...240.1765l&link_type=abstract

Science (ISSN 0036-8075), vol. 240, June 24, 1988, p. 1765-1767.

Other

37

Line Spectra, Solar Constant, Solar Maximum Mission, Solar Spectra, Spectrophotometry, Sunspot Cycle, Chromosphere, Photosphere, Random Noise, Solar Magnetic Field

Scientific paper

Active Cavity Radiometer Irradiance Monitor (ACRIM) solar constant measurements from 1980 to 1986 are compared with ground-based, irradiance spectrophotometry of selected Fraunhofer lines. Both data sets were identically sampled and smoothed with an 85-day running mean, and the ACRIM total solar irradiance (S) values were corrected for sunspot blocking (Sc). The strength of the mid-photospheric manganese 539.4-nanometer line tracks almost perfectly with ACRIM Sc. Other spectral features formed high in the photosphere and chromosphere also track well. These comparisons independently confirm the variability in the ACRIM Sc signal, indicate that the source of irradiance is faculae, and indicate that ACRIM Sc follows the 11-year activity cycle.

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