The phrase "insolation level" is correct and usable in written English.
It can be used in contexts related to solar radiation and climate studies.
Example: "The insolation level in this region has increased significantly over the past decade, impacting local agriculture."
Alternatives: "solar radiation level" or "sunlight exposure level."
Precipitation surely decreases the solar insolation level significantly.
In Bangladesh, average insolation level is pretty high from 4 to 5 kWh/day around the year, which ensures the potential of solar power harvesting for solar still (NASA 2015).
Via a computational tool based on the ray-tracing method, the sensitivity of the geometric concentration ratio, rim angle, shadow angle, incidence angle and hourly insolation level to the optical performance of the concentrator are evaluated.
When this measure of insolation was modeled as an ordinal variable, each successively lower insolation level compared to the adjacent higher insolation level had 1.06 (95% CI 1.02 1.11) fold odds of cognitive impairment.
The insolation level affects the density of wood because the smaller amount of incoming solar radiation could reduce the photosynthesis rate (Gindl, 1999; Berninger et al., 2004).
The insolation level measured for this lowland and distant station may differ considerably from the real situation in a mountain area.
The collectors were tested at the insolation levels from 300 to 900 W/m during the month of March 2013 May 2013.
Solar insolation levels are less important, being significant for less than one third of the time-steps sampled.
The photovoltaic (PV) cells suffer efficiency drop as their operating temperature increases especially under high insolation levels.
The major benefit of the proposed model is its adaptability and flexibility to capture the detailed effects of varying insolation levels through stochastic transitions.
It is also seen that the performance of IC method is very sensitive to its perturbation size, especially at low insolation levels.
