Topic
Solar constant
About: Solar constant is a research topic. Over the lifetime, 967 publications have been published within this topic receiving 29647 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: The mean absolute intensity of the solar continuum has been found by averaging the most reliable recent observational data from different authors as mentioned in this paper, using the modern experimental data on the solar constant, the spectral energy distribution, the limb darkening, and the blanketing effect.
Abstract: The mean absolute intensity of the solar continuum has been found by averaging the most reliable recent observational data from different authors. We used the modern experimental data on the solar constant, the spectral energy distribution, the limb darkening, and the blanketing effect. The continuum intensity is determined for the center disc and the entire disc. The brightness temperatures are compared with similar temperatures in the model of the photosphere.
01 Jan 1972
TL;DR: In this article, the design and development of two solar radiation simulators with an intensity variation ranging from 0.01 to greater than 100 solar constants under vacuum conditions are discussed, and the characteristics of the simulators are presented in terms of spectral content, beam uniformity, and stability.
Abstract: The design and development of two solar radiation simulators with an intensity variation ranging from 0.01 to greater than 100 solar constants under vacuum conditions are discussed. The characteristics of the simulators are presented in terms of spectral content, beam uniformity, and stability. Preliminary thermal radiative property data obtained at high temperatures are reported. The general operating characteristics of the simulator are automatic starting, control of both positive and negative electrodes, and uninterrupted operation for periods in excess of 24 hours.
01 Jan 1969
TL;DR: In this paper, a brass disc pyrheliometer was used to measure the flux of energy emitted by the sun and reaching a brass disk, painted dead black, and a thermometer indicated the rise of temperature of the brass disc.
Abstract: We intend to measure the flux of energy, emitted by the sun, and reaching a brass disc, painted dead black. The radiation is absorbed; a thermometer indicates the rise of temperature of the brass (Figure 47). Our instrument is a simplification of Abbot’s ‘silver disc pyrheliometer’. The measurement is admittedly rough but it gives the order of magnitude.
15 May 2023
TL;DR: In this paper , the authors presented the future plan for the solar measurements in the Fengyun 3 series (FY-3) in 2019 and 2020, and the SIM-II together with the Solar Spectral Irradiation Monitor (SSIM) have been deployed on the orbit mounted on FY-3E (early-morning orbit EM) in 2021.
Abstract: Fengyun 3 series (FY-3) is the second generation polar orbiting meteorological satellite in China. There are 5 satellites have been launched since the first satellite FY-3A in 2008. The solar irradiance is one of important parameters to measure by FY-3 series. The instrument to measure the solar irradiance is called Solar Irradiance Monitor (SIM). The SIM was deployed on the orbit since FY-3A (morning orbit AM) in 2008 and FY-3B (afternoon orbit PM) in 2010. SIM was upgraded to SIM-II mounted on FY-3C (AM orbit) in 2013. The sensitivity, absolute accuracy and stability of the instrument has been improved with the more accurate control on the solar disk tracking system and instrument environment temperature maintaining system. The SIM-II together with the Solar Spectral Irradiation Monitor (SSIM) have been deployed on the orbit mounted on FY-3E (early-morning orbit EM) in 2021. This presentation overviews the FY program. The specification and performance of SIM, SIM-II and SSIM have been illustrated. The measured Total Solar Irradiance (TSI) product has been compared with the similar measurements on SOHO/VIRGO, SORCE, TSIS-1, etc. The future plan for the solar measurements in FY-3 series has been presented in the last part.
01 Jan 2005
TL;DR: In this article, it was shown that the solar irradiance varies with time as much as 0.4% during the observation time span (Hickey et al., 1980), but there are experimental data suggesting that it varied much greater during geological periods.
Abstract: The Orbital theory presumes that the solar irradiance was constant during geological periods of time. Recent studies demonstrated that this presumption is not precise. Direct satellite measurements of the solar constant demonstrated that it varies with time as much as 0.4% during the observation time span (Hickey et al., 1980), but there are experimental data suggesting that it varied much greater during geological periods. Stuiver & Braziunas (1989) demonstrated that longer solar cycles are more than one order of magnitude stronger, than the solar cycles covered by direct measurements. Increasing of the ice volume and the related sea level change during glaciations produces changes in the inertial moment of the Earth and resulting changes in the speed of Earth’s rotation (Tenchov et al., 1993). Orbital variations cause also some deformation of the solid Earth and redistribution of the Ocean masses (Morner, 1983). In result theoretical Milankovich curves can be used only for qualitative reference. For quantitative correlation it is necessary to use experimental records of the solar insolation, because they contain also variations of the solar irradiance and number of others not covered by the Orbital theory.