Sunspot photometry and the total solar irradiance deficit measured in 1980 by ACRIM

Astronomy and Astrophysics – Astrophysics

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Astronomical Photometry, Irradiance, Solar Radiation, Sunspots, Solar Activity, Solar Constant, Solar Maximum Mission, Solar Temperature

Scientific paper

Until now a simple photometric sunspot index (PSI) model was used to describe the contribution of sunspots to the solar irradiance deficit measured by ACRIM. In this work, this model is replaced by a photometry of sunspot pictures for the period from August 19 to September 4, 1980, taking into account the individual features, like lightbridges or umbral dots, of each spot. The main results of this preliminary analysis are: (1) the A(u)/A(p) ratios and also the alpha values vary in a wide range and are by no means constant as in the PSI model; (2) the general trend of the irradiance deficit from the analysis agrees well with the ACRIM measurements; and (3) on some days there are differences of more than 50 percent between the deficits derived from the measurements and from the PSI model.

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