Response of the Middle Atmosphere's Chemical Composition due to Solar Proton Events

Details Response of the Middle Atmosphere's Chemical Composition due to Solar Proton Events Response of the Middle Atmosphere's Chemical Composition due to Solar Proton Events

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p23a0052k&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #P23A-0052

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0340 Middle Atmosphere: Composition And Chemistry

Scientific paper

The chemical composition of the middle atmosphere can be strongly influenced by Solar Proton Events (SPEs) and Energetic Electron Precipitation Events (EEPs). These events are well known sources of NOx (N, NO, NO2) and HOx (H, OH, HO2), which both contribute to ozone loss in the middle atmosphere. The processes of NOx, HOx production and the resulting O3 loss is quite well investigated and appears to be well understood (e.g., Jackmann et al, 2000)1. However, recent measurements of the partitioning of NOy and chlorine activation during the October 2003 event (e.g. by the MIPAS/ENVISAT instrument) show that also other constituents -- NOy and chlorine species -- are affected by these events. These are not equally well investigated and understood. This study compares data of suitable satellite measurements, e.g of the Halogen Occultation Experiment (HALOE) onboard the UARS satellite with a global chemistry- transport model of the middle atmosphere to investigate the impact of SPE's on other constituents beside O3 and NOy e.g., on chlorine compounds. \begin{small} 1 {Jackman, C.H. and Fleming, E.L. and Vitt, F.M.} (2000), {Influence of extremely large solar proton events in a changing stratosphere}, \it{J. Geophys. Res.,105,}11659-11670.

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