Cooling of the sun's photosphere coincident with increased sunspot activity

Details Cooling of the sun's photosphere coincident with increased sunspot activity Cooling of the sun's photosphere coincident with increased sunspot activity

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.272..340l&link_type=abstract

Nature, vol. 272, Mar. 23, 1978, p. 340, 341.

Other

17

Cooling, Photosphere, Solar Activity Effects, Solar Temperature, Sunspots, Astronomical Spectroscopy, Black Body Radiation, Brightness Temperature, Limb Darkening, Solar Spectra, Stellar Luminosity

Scientific paper

Long-term monitoring of the spectroscopic temperature of integrated sunlight shows that in 1977, at the beginning of solar cycle number 21, the sun cooled by about six deg K, corresponding to a reduction of about 0.5% in luminosity. The luminosity reduction, which may be of importance in interpreting the sun-terrestrial weather relationship, is derived on the assumption that the sun is a black body. Since the sun actually is a gray body, exhibiting limb darkening and other temperature inhomogeneities, the estimated luminosity reduction may not be accurate.

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