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Title: Estimation of the cloud transmittance from radiometric measurements at the ground level

The extinction of solar radiation due to the clouds is more significant than due to any other atmospheric constituent, but it is always difficult to be modeled because of the random distribution of clouds on the sky. Moreover, the transmittance of a layer of clouds is in a very complex relation with their type and depth. A method for estimating cloud transmittance was proposed in Paulescu et al. (Energ. Convers. Manage, 75 690–697, 2014). The approach is based on the hypothesis that the structure of the cloud covering the sun at a time moment does not change significantly in a short time interval (several minutes). Thus, the cloud transmittance can be calculated as the estimated coefficient of a simple linear regression for the computed versus measured solar irradiance in a time interval Δt. The aim of this paper is to optimize the length of the time interval Δt. Radiometric data measured on the Solar Platform of the West University of Timisoara during 2010 at a frequency of 1/15 seconds are used in this study.
Authors:
 [1] ;  [2]
  1. Faculty of Mathematical, Physical and Natural Sciences, University of Palermo, Piazza Marina 61, 90133 Palermo (Italy)
  2. Faculty of Physics, West University of Timisoara, Bd. V. Parvan 4, 300223 Timisoara (Romania)
Publication Date:
OSTI Identifier:
22390732
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1634; Journal Issue: 1; Conference: TIM-13 Physics Conference, Timisoara (Romania), 21-24 Nov 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CLOUDS; GROUND LEVEL; HYPOTHESIS; LAYERS; LIGHT TRANSMISSION; RADIANT FLUX DENSITY; RANDOMNESS; SKY; SOLAR RADIATION; SUN