A refined measurement of the sunspot radiative flux deficit

Physics

Scientific paper

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Isophotes, Photosphere, Radiative Transfer, Solar Atmosphere, Solar Flux, Sunspots, Astronomical Maps, Solar Constant

Scientific paper

New measurements of the radiative flux deficits of two large sunspots are presented, based on detailed isophotometric maps. Results are given separately for umbrae and penumbrae. The umbral and penumbral deficits are 4-5 x 10 to the 10th and 1-1.5 x 10 to the 10th erg/sq cm-s respectively, the larger figures referring to the larger spot. Over limited areas centered on the umbral 'cores' the deficits for the two spots amount to 76 and 86% of the photospheric flux.

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