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| Titel |
Three dimensional model simulations of the impact of solar particle precipitation on the upper polar atmosphere |
| VerfasserIn |
Nadine Wieters, Holger Winkler, Miriam Sinnhuber, Justus Notholt, Jan Maik Wissing, Uwe Berger, Gabriele Stiller, Thomas von Clarmann, Bernd Funke |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250048527
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| Zusammenfassung |
| Solar eruptions and geomagnetic storms can produce fluxes of high-energy protons and
electrons, so-called Solar Energetic Particle Events, which can enter the Earth’s atmosphere
especially in polar regions. These particle fluxes primarily cause ionisation and excitation in
the upper atmosphere, and thereby the production of HOx and NOx compounds, which are
catalysts for the reduction of ozone.
Besides the formation of HOx and NOx, and the resultant decrease of ozone, the
abundance of other species like HCl, ClONO2, and NOy is affected by solar particle
induced ion-chemistry, as observations indicate.
To simulate the impact of such particle events on the middle and upper atmosphere,
ionisation rates calculated by the Atmospheric Ionization Module Osnabrück AIMOS
(University of Osnabrück) have been implemented into the Bremen 3D Chemistry
and Transport Model. The model is driven by meteorological data provided by the
Leibniz-Institute Middle Atmosphere Model LIMA (IAP Kühlungsborn), to cover altitudes
up to the mesopause. To include the ion-chemistry of ClOy and NOy in the neutral
chemistry scheme of the Bremen 3D CTM, parameterised production rates calculated
by the University of Bremen Ion-Chemistry model UBIC are implemented in the
model.
Model calculations for different large solar proton events have been carried out
and results will be presented and compared to measurements by the Michelson
Interferometer for Passive Atmospheric Sounding MIPAS (ENVISAT) instrument. |
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