Physics
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..152..125n&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 152, no. 1, p. 125-130
Physics
2
Faculae, Narrowband, Photosphere, Solar Activity, Solar Radiation, Stellar Spectrophotometry, Charge Coupled Devices, Periodic Variations, Photometers, Solar Maximum Mission, Sunspots
Scientific paper
Spatially-resolved precise photometric observations of the whole Sun at wavelengths of 545 nm Full Width at Half Maximum ((FWHM) 40 nm) were carried out by using the CCD solar surface photometer. Bright parts of photospheric network have contrast of several tenths of percent, and their contribution to the total irradiance is approximately half that of active region faculae. The solar irradiance variations estimated from sunspots, faculae and active network (contrast greater than 0.3%) agreed with the Active Cavity Radiometer Irradiance Monitor (ACRIM) data. The quiet Sun irradiance used in the present results was different from the total irradiance at the solar minimum observed by the ACRIM, which indicates unmeasured components (contrast greater than 0.1%) cause the 11-year cycle irradiance variation.
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