The clearness index is a measure of atmosphere clearness. It is calculated as the fraction of the actual total solar radiation on the surface of the Earth during a certain period over the theoretical maximum (i.e., clear sky) radiation during the same period. [1] [2] The clearness index is a dimensionless quantity and can vary from 0 (sky is completely covered) to 1 (perfectly sunny). [3]
- ^ "NASA POWER | Docs | Methodology | Energy Fluxes | Derived Parameters - NASA POWER | Docs". power.larc.nasa.gov. Retrieved 3 March 2022.
- ^ "Physical models used > Irradiation models > Clearness Index". www.pvsyst.com. Retrieved 3 March 2022.
- ^ "Clearness Index". www.homerenergy.com. Retrieved 3 March 2022.
 | This standards- or measurement-related article is a stub. You can help Wikipedia by expanding it. |
 | This article about atmospheric science is a stub. You can help Wikipedia by expanding it. |
The clearness index is a measure of atmosphere clearness. It is calculated as the fraction of the actual total solar radiation on the surface of the Earth during a certain period over the theoretical maximum (i.e., clear sky) radiation during the same period. [1] [2] The clearness index is a dimensionless quantity and can vary from 0 (sky is completely covered) to 1 (perfectly sunny). [3]
- ^ "NASA POWER | Docs | Methodology | Energy Fluxes | Derived Parameters - NASA POWER | Docs". power.larc.nasa.gov. Retrieved 3 March 2022.
- ^ "Physical models used > Irradiation models > Clearness Index". www.pvsyst.com. Retrieved 3 March 2022.
- ^ "Clearness Index". www.homerenergy.com. Retrieved 3 March 2022.
|
| This standards- or measurement-related article is a stub. You can help Wikipedia by expanding it. |
|
| This article about atmospheric science is a stub. You can help Wikipedia by expanding it. |