Premium
Destruction of the tertiary ozone maximum during a solar proton event
Author(s) -
Seppälä A.,
Verronen P. T.,
Sofieva V. F.,
Tamminen J.,
Kyrölä E.,
Rodger C. J.,
Clilverd M. A.
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl025571
Subject(s) - ozone , atmospheric sciences , atmosphere (unit) , altitude (triangle) , polar , forcing (mathematics) , proton , environmental science , middle latitudes , flux (metallurgy) , ozone depletion , storm , mesosphere , physics , meteorology , stratosphere , chemistry , nuclear physics , astronomy , geometry , mathematics , organic chemistry
Ozone observations from the GOMOS instrument together with a coupled ion and neutral chemistry model are used to study the effects of the January 2005 solar storms on the polar winter middle atmosphere. The model results indicate strong HO x and NO x enhancements in the mesosphere, and simultaneous ozone depletion maximizing between 70–80 km. During strong proton forcing GOMOS measurements show the destruction of the tertiary ozone maximum, observed at polar latitudes near 72 km before the events. This altitude is concurrent with the largest HO x enhancements in the model results. We observe for the first time the disappearance of the tertiary ozone maximum, and determine the underlying cause. With subsiding proton forcing GOMOS measurements show the reappearance of the tertiary ozone maximum, returning to normal values by January 24. Our results indicate that even moderate solar events (>10 MeV proton flux of >5000 pfu) can cause significant ozone depletion (>70%) in the middle atmosphere.