Scientific journal publication Solar actinic radiation (280-420 nm) in the cloud-free troposphere between ground and 12 km altitude: measurements and model results. Hofzumahaus, A.; Kraus, A.; Kylling, A.; Zerefos, C.S. Publication details Journal: J. Geophys. Res., 107, 8139, 2002 DOI: 10.1029/2001JD900142