Comparison of UV-B Distribution at Bahir Dar vs. Ras  Dashen

Alemu Wassihun

dc.contributor.author	Alemu Wassihun
dc.date.accessioned	2023-01-12T07:05:10Z
dc.date.available	2023-01-12T07:05:10Z
dc.date.issued	2022-12
dc.identifier.uri	http://ir.bdu.edu.et/handle/123456789/14887
dc.description.abstract	This study investigates the extent of solar ultraviolet radiation (UVR), wavelength ranges from 280nm-315nm which is called UV-B, distribution in Bahir Dar and Ras Dashan.On the other hand, when materials exposed to the solar ultraviolet ray, materials tend to change their colour (fade), exposed to weathering; where all this result in degrading and shortened service life of materials.Besides, the UV-B has effect on semiconductor materials in relation to charge transport and photoelectric effect. Furthermore, the UV-B has penetrative effect on our body, which can result in skin cancer, sunburn, cataract and skin aging. In this study, satellite based data (from NASA) was used to study solar UV-B radiation in daily, monthly and annually in selected two places. The study period ranges from beginning of January 1st 2010 until the end of December 2020. The results indicate that UV-B, in both place, are periodical – season and month dependent within each year. The highest and lowest UV-B radiations at Ras Dashen were recorded in spring (mainly April) and winter (mainly December), respectively. On the other hand, the highest and lowest UV-B radiations at Bahir Dar were recorded in spring (mainly April) and summer (July) respectively. Using mean equation formula, maximum average in Bahir Dar was 0.468W/m2 whilst in Ras Dashen found to be 0.445 W/m2 . Furthermore, on average at different months/ seasons, the UV-B radiation was higher in Bahir Dar than in Ras Dashen.	en_US
dc.language.iso	en_US	en_US
dc.subject	Physics	en_US
dc.title	Comparison of UV-B Distribution at Bahir Dar vs. Ras Dashen	en_US
dc.type	Thesis	en_US