GEOGRAPHY & CARTOGRAPHY CALCULATOR
Surfaceclear Sky Irradiance
A precise tool.
What is the Surfaceclear Sky Irradiance & How does it work?
Clear‑sky global irradiance represents the amount of solar energy reaching a horizontal surface when clouds are absent, and it is a cornerstone for solar‑energy assessments and climate studies.
The irradiance depends on the solar constant, the Earth‑Sun distance correction, atmospheric transmissivity, and the solar zenith angle, which together modulate the direct solar beam reaching the ground.
Accurate estimation of this quantity enables designers to size photovoltaic systems, researchers to model surface temperature, and meteorologists to forecast solar‑driven processes.
G = I_{sc}\,E_{0}\,\tau\,\cos\theta
G = clear‑sky global irradiance (W/m²)
I_{sc} = solar constant (~1361 W/m²)
E_{0} = Earth‑Sun distance factor
tau = atmospheric transmissivity
theta = solar zenith angle (degrees)
I_{sc} = solar constant (~1361 W/m²)
E_{0} = Earth‑Sun distance factor
tau = atmospheric transmissivity
theta = solar zenith angle (degrees)
Parameters
Result
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Frequently Asked Questions
What is clear-sky global irradiance?
It’s the amount of solar energy reaching a horizontal surface when there are no clouds.
Why is clear-sky global irradiance important?
It’s crucial for designing photovoltaic systems and conducting climate studies.
What factors affect clear-sky global irradiance?
Factors include the solar constant, Earth-Sun distance, atmospheric transmissivity, and solar zenith angle.
How do I use this calculator to estimate clear-sky global irradiance?
Input the necessary parameters like location, time, and weather conditions to get an accurate estimation.
Can this calculator be used for any location on Earth?
Yes, it can be used for any location by adjusting the input parameters accordingly.
What is the difference between clear-sky and actual global irradiance?
Clear-sky irradiance assumes no clouds, while actual irradiance accounts for cloud cover and other atmospheric conditions.
How accurate are the estimates provided by this calculator?
The accuracy depends on the input data quality; it provides a good estimate but may vary based on real-world conditions.
Results are for informational purposes only and do not constitute professional advice.