Solar Forecasts Based on the Clear Sky Index or the Clearness Index: Which Is Better? [PDF]
Solar, 2022 In the realm of solar forecasting, it is common to use a clear sky model output to deseasonalise the solar irradiance time series needed to build the forecasting models.
Philippe Lauret +3 more
doaj +7 more sources
Cloud cover effect of clear-sky index distributions and differences between human and automatic cloud observations [PDF]
Solar Energy, 2017 The statistics of clear-sky index can be used to determine solar irradiance when the theoretical clear sky irradiance and the cloud cover are known. In this paper, observations of hourly clear-sky index for the years of 2010--2013 at 63 locations in the UK are analysed for over 1 million data hours.
Jamie M Bright, Christopher Smith
exaly +7 more sources
Evaluating Solar Energy Potential Through Clear Sky Index Characterization Across Elevation Profiles in Mozambique [PDF]
SolarThe characteristics and types of the sky can greatly influence photovoltaic (PV) power generation, potentially leading to a reduction in both the lifespan and efficiency of the entire system. Driven by the challenge of addressing fluctuations in solar PV
Fernando Venâncio Mucomole +2 more
doaj +3 more sources
KPV: A clear-sky index for photovoltaics
Solar Energy, 2014 Abstract The rapidly growing installed base of distributed solar photovoltaic (PV) systems is causing increased interest in forecasting their power output. A key step towards this is accurately estimating the output from a PV system based on the known output from a nearby PV system.
Engerer, Nicholas, Mills, Franklin
exaly +3 more sources
Improved Clear Sky Model from In Situ Observations and Spatial Distribution of Aerosol Optical Depth for Satellite-Derived Solar Irradiance over the Korean Peninsula [PDF]
Remote Sensing, 2022 In solar resource assessment, the climatological environment of the target area is objectively quantified by the cloudiness or clear sky index, which is defined as the ratio of global horizontal irradiance to clear sky solar insolation.
Chang Ki Kim +2 more
doaj +2 more sources
Extracting Leaf Area Index by Sunlit Foliage Component from Downward-Looking Digital Photography under Clear-Sky Conditions [PDF]
Remote Sensing, 2015 The development of near-surface remote sensing requires the accurate extraction of leaf area index (LAI) from networked digital cameras under all illumination conditions. The widely used directional gap fraction model is more suitable for overcast conditions due to the difficulty to discriminate the shaded foliage from the shadowed parts of images ...
Ronghai Hu, Weiliang Fan, Baodong Xu
exaly +3 more sources
Irradiance Nowcasting by Means of Deep-Learning Analysis of Infrared Images
Forecasting, 2022 This work proposes and evaluates a method for the nowcasting of solar irradiance variability in multiple time horizons, namely 5, 10, and 15 min ahead.
Alessandro Niccolai +4 more
doaj +1 more source
Remote Sensing, 2023 Leaf area index (LAI) and canopy chlorophyll content (CCC) are important indicators that describe the growth status and nitrogen deficiencies of crops.
Wenjuan Li +6 more
doaj +1 more source
Prediction of Solar Power Using Near-Real Time Satellite Data
Energies, 2021 Solar energy production is affected by the attenuation of incoming irradiance from underlying clouds. Often, improvements in the short-term predictability of irradiance using satellite irradiance models can assist grid operators in managing intermittent ...
Abhnil Amtesh Prasad, Merlinde Kay
doaj +1 more source
Classification of Sky Cover by the Clearness Index (Kt) in Maputo - Mozambique
Research, Society and Development, 2022 The present paper makes an analysis of the frequency of sky conditions in the city of Maputo/Mozambique based on the clearness index (Kt). From the determination of extraterrestrial solar radiation and measured data of four years of global daily radiation, Kt was calculated.
Domingos Mário Zeca Fernando +4 more
openaire +2 more sources