On the altitude dependence of solar effective UV

Measurements of the solar biological effective UV radiation were carried ou t during the period from 7 to 14 June 1997 by using a radiometer flown on a Falcon aircraft, at several altitude levels, from sea level up to 13 Km. T he results showed that an increase in the biological effective UV radiation of about 7% per kilometer occurs throughout the troposphere. This increase has been compared with the burden ozone content at each height level as it was derived from concurrent ozone measurements obtained from ozonesonde as cents. This comparison showed a strong anticorrelation between the biologic al effective UV radiation and the total ozone content above the UV measurem ent height level. (C) 1999 Elsevier Science Ltd. Ail rights reserved.