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Feb 14, 2022 · In certain conditions, the conventional infrared (IR) methods used for nocturnal cloud detection, such as the commonly used 11–3.9 μm brightness temperature difference, offer poor …
Oct 1, 2003 · As a reference for the magnitude of the cloud influence, clear-sky irradiance values are estimated as a simple function of solar zenith angle and the earth–sun distance. The function …
Dec 10, 2024 · Specifically, we analyze and summarize the factors affecting cloud detection, such as surface background information, vertical cloud distribution, hyperspectral IR channel …
Sep 1, 2016 · An all-sky imaging system is deployed to estimate the effect of clouds on incident solar irradiance, for a 2-year period over the city of Thessaloniki, Greece.
Feb 1, 2025 · Our analysis reveals a significant presence of scattered clouds, broken clouds, and mismatches between satellite- and surface-based cloud data at 17 surface sites across the …
Environmental photodegradation is dependent on the solar irradiance that reaches the Earth's surface, and photodegradation half-lives of contaminants are typically estimated assuming clear …
Oct 1, 2003 · As a reference for the magnitude of the cloud influence, clear-sky irradiance values are estimated as a simple function of solar zenith angle and the earth-sun distance. The function …
Feb 22, 2024 · Spaceborne formaldehyde (HCHO) measurements constitute an excellent proxy for the sources of non-methane volatile organic compounds (NMVOCs). Past studies suggested …
As a reference for the magnitude of the cloud influence, clear-sky irradiance values are estimated as a simple function of solar zenith angle and the earth–sun distance. The function is derived …
tegrated difuse-to-direct irradiance ratio (IDR), which is derived from modeled hyperspectral components and provides a robust indicator of sky conditions. The model is developed using 15 …
Nov 11, 2024 · Further investigations would concern clear-sun-with-cloud and cloudy-sun conditions, which are prevalent in Lille, in order to analyze the variability in the surface solar …
Mar 30, 2024 · To observe this sunlight in detail, we have deployed dense networks of low-cost radiometers in two field campaigns. Using these new measurements, we have found different …
Mar 1, 2017 · Cloud ceilometers overestimate the prevalence of clear and overcast skies. Distributions of clear-sky index depend on okta and solar elevation angle. Human and ceilometer …
Dec 22, 2024 · Cloud cover is one of the most obvious and significant factors affecting solar radiation measurements. Clouds can scatter and absorb sunlight, reducing direct irradiance while …
May 15, 2003 · A natural extension of the IRIS and IMG comparison would thus be to study the differences seen under ‘all-sky’ and ‘cloudy’ conditions to see whether inferences can be made …
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