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| Titel |
The ECOMA 2007 campaign: rocket observations and numerical modelling of aerosol particle charging and plasma depletion in a PMSE/NLC layer |
| VerfasserIn |
A. Brattli, Ø. Lie-Svendsen, K. Svenes, U.-P. Hoppe, I. Strelnikova, M. Rapp, R. Latteck, M. Friedrich |
| 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 (2009-02-17), S.781-796 |
| Datensatznummer |
250016413
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| Publikation (Nr.) |
 copernicus.org/angeo-27-781-2009.pdf |
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| Zusammenfassung |
| The ECOMA series of rocket payloads use a set of aerosol particle, plasma,
and optical instruments to study the properties of aerosol particles and
their interaction with the ambient plasma environment in the polar mesopause
region. In August 2007 the ECOMA-3 payload was launched into a region with Polar
Mesosphere Summer Echoes (PMSE) and noctilucent clouds (NLC). An electron
depletion was detected in a broad region between 83 and 88 km, coincident
with enhanced density of negatively charged aerosol particles. We also find
evidence for positive ion depletion in the same region. Charge neutrality
requires that a population of positively charged particles smaller than 2 nm
and with a density of at least 2×108 m−3 must also have been
present in the layer, undetected by the instruments. A numerical model for
the charging of aerosol particles and their interaction with the ambient
plasma is used to analyse the results, showing that high aerosol
particle densities are required in order to explain the observed ion density
depletion. The model also shows that a very high photoionisation rate is
required for the particles smaller than 2 nm to become positively charged,
indicating that these may have a lower work function than pure water ice. |
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