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| Titel |
The influence of ozone concentration on the lower ionosphere – modelling and measurements during the 29-30 October 2003 solar proton event |
| VerfasserIn |
A. Osepian, S. Kirkwood  , P. Dalin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 2 ; Nr. 27, no. 2 (2009-02-05), S.577-589 |
| Datensatznummer |
250016397
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| Publikation (Nr.) |
 copernicus.org/angeo-27-577-2009.pdf |
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| Zusammenfassung |
| A numerical model of D-region ion chemistry is used to study the influence
of the ozone concentration in the mesosphere on
ion-composition and electron density during solar proton events (SPE). We
find a strong sensitivity in the lower part of the D-region, where negative
ions play a major role in the ionization balance. We have chosen the strong
SPE on 29–30 October 2003 when very intense proton fluxes with a hard
energetic spectrum were observed. Deep penetration into the atmosphere by
the proton fluxes and strong ionisation allows us to use measurements of
electron density, made by the EISCAT 224 MHz radar, starting from as low as
55 km. We compare the electron density profiles with model results to
determine which ozone concentration profiles are the most appropriate for
mesospheric altitudes under SPE conditions. We show that,
during daytime, an ozone profile corresponding to depletion by a factor of 2
compared to minimum model concentrations for quiet conditions (Rodrigo et
al., 1986), is needed to give model electron density profiles
consistent with observations. Simple incorporation of minor neutral
constituent profiles (NO, O and O3) appropriate for SPE conditions
into ion-chemistry models will allow more accurate modeling of electron and
ion densities during such events, without the need to apply a complete
chemical model calculating all neutral species. |
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