Scientific journal publication High levels of ultraviolet radiation observed by ground-based instruments below the 2011 Arctic ozone hole. Bernhard, G.; Dahlback, A.; Fioletov, V.; Heikkilä, A.; Johnsen, B.; Koskela, T.; Lakkala, K.; Svendby, T. Publication details Journal: Atmospheric Chemistry and Physics, 13, 10573–10590, 2013 DOI: 10.5194/acp-13-10573-2013