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Solar constant
About: Solar constant is a research topic. Over the lifetime, 967 publications have been published within this topic receiving 29647 citations.
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TL;DR: The variation in the solar constant, S(t), is reproduced by the SOLAR2000 Research Grade v105 empirical solar irradiance model and is described for 5 solar cycles between cycles 18 and 23 (February 14, 1947 through May 31, 2000) as mentioned in this paper.
13 citations
TL;DR: In this paper, two types of ceramic woven fabrics were irradiated by 17 solar constants of ultraviolet light at an elevated temperature, and the available data from the solar absorptance as a function of an ultraviolet dose up to 52,000 equivalent sun hours was extrapolated to the mission's end-of-life dose of 100,000-equivalent sun hours.
Abstract: This paper presents two test campaigns in the frame of the ongoing program for the European Space Agency’s mission toMercury. Improvements on the experimental setup are presented that enable ground-based simulation of such a harsh space environment. The thermal endurance of white ceramic paints is investigated at 350 C. The solar absorptance of all paints increased significantly. Two types of ceramic woven fabrics were irradiated by 17 solar constants of ultraviolet light at an elevated temperature. The available data from the solar absorptance as a function of an ultraviolet dose up to 52,000 equivalent sun hours was extrapolated to the mission’s end-of-life dose of 100,000 equivalent sun hours. The custom-baked Astroquartz 2 was the best performing material with an estimated end-of-life solar absorptance of 0.35.
13 citations
TL;DR: The long-term mean cloud-attenuation increases with increasing solar zenith angle, consistent with radiative transfer calculations which treat a cloud as a plane parallel layer with a strong bias toward forward scattering and an albedo for diffuse radiation near 0.1 as discussed by the authors.
13 citations
01 Jan 1983
TL;DR: In this article, an analysis of the periodicities found in the Nimbus-7 satellite measurements of solar irradiance (Solar Constant) indicates variations on three scales: high frequency periodicity due to the solar rotation period, integral effect of the high frequency oscillation over an 11 year solar cycle, and the third variation (secular trend) is discussed in regard to the high precision cavity data and the recent record of high altitude solar constant measurements.
Abstract: An analysis of the periodicities found in the Nimbus-7 satellite measurements of solar irradiance (Solar Constant) indicates variations on three scales. Two of these variations are shown to be related to variations in solar activity as given by various indicators of solar photosphere disturbances. The high frequency periodicity is due to the solar rotation period. The second periodicity is based on the integral effect of the high frequency oscillation over an 11 year solar cycle. The third variation (secular trend) is discussed in regard to the high precision cavity data and the recent record of high altitude solar constant measurements.
12 citations