title: Medically important solar ultraviolet A. Radiation measurements.
abstract: Results from a 6-year study of solar ultraviolet A (UVA) radiation measurements at the equatorial location of Penang (5 degrees N) are presented. On clear days, the diurnal flux reaches a very high dosage of about 3.0 x 10(-2) KWHM-2 around midday. The average daily total flux is in the range of 1.6 x 10(-1) KWHM-2 and does not change much seasonally. The high 83% cloud cover only reduces the incoming flux to about half. The radiation flux represents a lower limit of the incident UVA radiation applicable to much of the equatorial/tropical region.
authors.affiliation: School of Physics, University of Science of Malaysia, Penang.
authors.forename: M
authors.initials: M
authors.lastname: Ilyas
authors.forename: D
authors.initials: D
authors.lastname: Abdul Aziz
authors.forename: M R
authors.initials: MR
authors.lastname: Tajuddin
mesh_terms: D001272:Atmosphere; D002386:Cataract / Q000209:etiology; D002940:Circadian Rhythm / Q000528:radiation effects; D006801:Humans; D008296:Malaysia; D010126:Ozone; D011874:Radiometry / Q000379:methods*; D012867:Skin / Q000528:radiation effects; D012993:Solar Energy; D013472:Sunlight; D014329:Tropical Climate; D014466:Ultraviolet Rays
chemical_list: D010126:Ozone