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On the cause of total irradiance variations observed by the CCD solar surface photometer

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Abstract

Spatially-resolved precise photometric observations of the whole Sun at wavelengths of 545nm (FWHM 40nm) 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>0.3%) agreed with the 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>0.1%) cause the 11-year cycle irradiance variation.

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  1. Hiraiso Solar Terrestrial Research Center, Communications Research Laboratory, Isozaki 3601, 311-12, Nakaminato, Ibaraki, Japan

    Jun Nishikawa

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  1. Jun Nishikawa
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Nishikawa, J. On the cause of total irradiance variations observed by the CCD solar surface photometer. Sol Phys 152, 125–130 (1994). https://doi.org/10.1007/BF01473194

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