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| Titel |
Meteor smoke influences on the D-region charge balance – review of recent in situ measurements and one-dimensional model results |
| VerfasserIn |
C. Baumann, M. Rapp, A. Kero, C.-F. Enell |
| 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 ; 31, no. 11 ; Nr. 31, no. 11 (2013-11-21), S.2049-2062 |
| Datensatznummer |
250086150
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| Publikation (Nr.) |
 copernicus.org/angeo-31-2049-2013.pdf |
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| Zusammenfassung |
| This work investigates the influence of meteoric smoke particles (MSP) on the
charge balance in the D-region ionosphere. Both experimental in situ
measurements and a one-dimensional ionospheric model reveal a clear impact of
MSP on the ionospheric composition of the D-region. The study reviews
rocket-borne in situ measurements of electron and positive ion density, which
show a distinct deficit of electrons in comparison to positive ions between
80 and 95 km. This deficit can be explained by the ambient negatively charged
MSP measured simultaneously with a Faraday cup. The influence of MSP on the
D-region charge balance is addressed with a simplified ionospheric model with
only six components, i.e. electrons, positive and negative ions and neutral
and charged MSP (both signs). The scheme includes reactions of plasma captured
by MSP and MSP photo reactions as well as the standard ionospheric
processes, e.g. ion-ion recombination. The model shows that the capture of
plasma constituents by MSP is an important process leading to scavenging of
electrons. Since Faraday cup measurements are biased towards heavy MSP
because of aerodynamical filtering, we have applied an estimate of this
filter on the modelled MSP densities. By doing that, we find good qualitative
agreement between the experimental data and our model results. In addition,
the model study reveals an increase of positive ions in the presence of MSP.
That is primarily caused by the reduced dissociative recombination with
electrons which have been removed from the gas phase by the
MSP. |
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