Mesospheric Production of Odd Hydrogen During the January 2005 Solar Proton Event

Details Mesospheric Production of Odd Hydrogen During the January 2005 Solar Proton Event Mesospheric Production of Odd Hydrogen During the January 2005 Solar Proton Event

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa41b1423v&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA41B-1423

Physics

0335 Ion Chemistry Of The Atmosphere (2419, 2427), 0340 Middle Atmosphere: Composition And Chemistry, 2427 Ionosphere/Atmosphere Interactions (0335), 2455 Particle Precipitation, 3360 Remote Sensing

Scientific paper

Among the most striking phenomena affecting ozone in the middle atmosphere are solar proton events (SPE). During SPEs, precipitation of energetic particles into the polar atmosphere results in production of odd hydrogen (HOx) and odd nitrogen (NOx) species. Enhancements of HOx and NOx lead to depletion of ozone through the well-known catalytic reaction cycles. Although the effects of SPEs on atmospheric minor constituents have been studied since the 1960s, there has been lack of HOx observations. Thus, the theory of HOx production, involving quite complex hydrate ion chemistry, has not been validated by direct measurements. We utilize measurements from the MLS/Aura and GOMOS/Envisat instruments together with a coupled 1-D ion and neutral chemistry model to study the production of odd hydrogen and depletion of ozone in the mesosphere during the January 2005 solar proton event. The unique observational data allow us for the first time to directly test the HOx production theory. We point out that models using the so-called PHOx/Q parameterization to include the effects of ion chemistry could underestimate the HOx production and the resulting ozone depletion in the mesosphere.

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