## Sources of uncertainty in solar irradiance

Uncertainty (error risk) is determined by both astronomical and geographic factors. The sun’s altitude angle (which affects the quality of the atmosphere) is also an

## Calculation and downscaling of solar irradiance

â‘ Calculation of total irradiancePer Schmetz pointed out that Cl should be proportional to the total clear sky index kt=GHI/GHIclear. A linear relationship is used in

## Factors affecting the dynamic range of total solar radiation

â‘  Non-uniform terrainIn coastal areas and some other arid areas, the ground albedo may change drastically within a relatively small range. Although today’s satellite navigation

## Cloud extinction: cloud index

Cloud extinction can be calculated directly using satellite information. The calculation process includes determining the cloud index (CI) according to the satellite imager and its

## What is the clear sky irradiance?

Clear sky irradiance refers to the total irradiance (GHlclear) and direct irradiance (DNlclear) of the solar radiation incident on the ground surface at a location

## What is the basic principle of satellites?

Meteorological satellites include polar orbiting satellites and geostationary satellites. Although polar-orbiting satellites are closer to the surface of the earth (about 850km vs. about 36,000km)

## Direct, scattered and total solar radiation and instrumental measurement

In the early 19th century, Claude Pouillet first tried to measure solar radiation. Since then, in order to meet the needs of renewable energy utilization

## Solar irradiance and factors affecting solar irradiance

Predicting the solar irradiance is the key to estimating the performance of the solar energy conversion system and ensuring the stable operation of the power

## What is concentrated solar power(CSP)?

Concentrating Solar Power (CSP), to be precise, should be “Concentrated Solar Thermal Power Generation”. Refers to a power generation method that uses a certain kind

## Do you know the basis and development of photovoltaics?

Heinrich Hertz first discovered the photoelectric effect in 1887, and Albert Einstein explained this phenomenon in 1905. Photovoltaic (PV) systems use the photoelectric effect of