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| Titel |
Modelling the effects of solar particle events on vibrationally excited hydroxyl |
| VerfasserIn |
Holger Winkler, Jan Maik Wissing, Georg Teiser, Christian von Savigny, Justus Notholt |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250124443
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| Publikation (Nr.) |
 EGU/EGU2016-3881.pdf |
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| Zusammenfassung |
| The main source of vibrationally excited hydroxyl molecules in the Earth’s mesosphere is
the reaction H + O3 → OH(v) + O2. The exothermicity of this process leads to
excitations of hydroxyl up to the 9th vibrational state. During solar particle events
(SPEs), energetic protons and electrons can enter the polar atmosphere and cause
ion-chemical perturbations. It is well established that both ozone and hydrogen are
affected by SPEs. As a result, the production rate of OH(v) changes. Additionally,
the quenching rates of OH(v) change due to increasing concentrations of atomic
oxygen. Furthermore, SPE induced temperature changes influence the chemistry of
OH(v).
We use a one-dimensional atmospheric chemistry model in combination with the University
of Bremen Ion Chemistry (UBIC) model to simulate the impact of major SPEs on
mesospheric OH(v = 0…9). For this purpose, SPE ionisation rates from AIMOS
(Atmospheric Ionization Module Osnabrück) are used. Temperature changes are considered
by predictions of the MSIS-E-90 atmosphere model as well as by data from the SABER
(Sounding of the Atmosphere using Broadband Emission Radiometry) satellite instrument.
The modelled radiative emissions of OH(v) are compared to satellite observations (SABER
and SCIAMACHY = Scanning Imaging Absorption Spectrometer for Atmospheric
CHartographY). |
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