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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 26, issue 2
Ann. Geophys., 26, 361-370, 2008
https://doi.org/10.5194/angeo-26-361-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: 3rd European Space Weather Week (ESWW)

Ann. Geophys., 26, 361-370, 2008
https://doi.org/10.5194/angeo-26-361-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  26 Feb 2008

26 Feb 2008

Solar particle effects on minor components of the Polar atmosphere

A. Damiani1,2, M. Storini2, M. Laurenza2, and C. Rafanelli1 A. Damiani et al.
  • 1ICES – International Center for Earth Sciences c/o CNR Istituto di Acustica "O.M. Corbino" – Area di Ricerca Roma-Tor Vergata, Via del Fosso del Cavaliere, 100–00133 Roma, Italy
  • 2Istituto di Fisica dello Spazio Interplanetario – INAF – Area di Ricerca Roma-Tor Vergata, Via del Fosso del Cavaliere, 100–00133 Roma, Italy

Abstract. Solar activity can influence the Earth's environment, and in particular the ozone layer, by direct modulation of the e.m. radiation or through variability of the incoming cosmic ray flux (solar and galactic particles). In particular, solar energetic particles (SEPs) provide additional external energy to the terrestrial environment; they are able to interact with the minor constituents of the atmospheric layer and produce ionizations, dissociations, dissociative ionizations and excitations. This paper highlights the SEP effects on the chemistry of the upper atmosphere by analysing some SEP events recorded during 2005 in the descending phase of the current solar cycle. It is shown that these events can lead to short- (hours) and medium- (days) term ozone variations through catalytic cycles (e.g. HOx and NOx increases). We focus attention on the relationship between ozone and OH data (retrieved from MLS EOS AURA) for four SEP events: 17 and 20 January, 15 May and 8 September. We confirm that SEP effects are different on the night and day hemispheres at high latitudes.

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