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Destruction of the tertiary ozone maximum during a solar proton event

Seppala, A.; Verronen, P.T.; Sofieva, V.F.; Tamminen, J.; Kyrola, E.; Rodger, C.J.; Clilverd, M.A.. 2006 Destruction of the tertiary ozone maximum during a solar proton event. Geophysical Research Letters, 33 (7), L07804. 4, pp. 10.1029/2005GL025571

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Abstract/Summary

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.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2005GL025571
Programmes: BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Sun Earth Connections
ISSN: 0094-8276
Additional Information. Not used in RCUK Gateway to Research.: Full text not available from this repository
Additional Keywords: Mesosphere, Stratosphere
NORA Subject Terms: Atmospheric Sciences
Date made live: 11 Sep 2007 15:03
URI: http://nora.nerc.ac.uk/id/eprint/972

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