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- W23971503 abstract "The purpose of the UV Index estimation is to help people effectively protect themselves from UV radiation, of which excessive exposure causes sunburn. UV index (UVI) has been estimated in Qena, Upper Egypt (26°17' N, 32°43' E, 97 m asl) at noon during the period (Apr. 2000 - Dec. 2005) using EP/TOMS satellite (UVIsat) and ground-based measurements (UVIgrd). Temporal variations of UVIsat and UVIgrd, also, comparison between them have been investigated. In addition, the effect of atmospheric conditions, in the form of cloud cover and aerosol index, on this comparison has been analyzed. The study revealed that, in all sky conditions, average value of UVIsat and UVIgrd were 9.39±2.60 and 8.1±2.4, respectively. While, in cloudless conditions (cloud cover CC = 0 oct.), their values became 9.98±2.39 and 8.53±2.10, respectively. In addition, the value that has more occurrence for UVIsat and UVIgrd, in both conditions (all sky and cloudless conditions), was 12 and 10, respectively. Regarding the comparison between UVIsat and UVIgrd, effects of clouds and aerosols were taken into consideration. So that, four data subsets were analyzed, subset 1: all sky conditions, subset 2: all cloudless cases, subset 3: cloudless cases with low aerosol index and subset 4: cloudy cases with low aerosol index. The study showed that UVIsat values were higher than the UVIgrd during all studied period under all studied conditions. The largest biases were found on heavy overcast days (positive biases reached to 42%)." @default.
- W23971503 created "2016-06-24" @default.
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- W23971503 date "2015-01-01" @default.
- W23971503 modified "2023-09-27" @default.
- W23971503 title "Comparison of UV Index from EP/TOMS with Ground-Based Measurements at Subtropical Location" @default.
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