Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.471..195r&link_type=abstract
In: 15th ESA Symposium on European Rocket and Balloon Programmes and Related Research, 28 - 31 May 2001, Biarritz, France. Ed.:
Physics
Polar Mesosphere, Summer Echoes, Noctilucent Clouds
Scientific paper
We describe a model of electron diffusion in the vicinity of charged aerosols in order to explain the reduction of electron mobility needed for the existence of PMSE. The physical processes involved are introduced and the model is used to explain recent observations of an artificial modulation of PMSE by ionospheric heating with the EISCAT heating facility. Using then a microphysical model of the generation and growth of mesospheric ice particles we consider whether the model yields a large enough number of negatively charged ice particles needed to understand the electron diffusivity reduction in terms of the physical processes currently incorporated in the ice particle model. Then introducing the charge number density of aerosol particles times the mean aerosol radius squared as a proxy for the possible existence of PMSE we find a nice agreement of simulated altitude profiles and the mean height distribution of PMSE. Finally, we find that at the lower edge of the ice particle layer the particles have grown large enough in order to give rise to an optically observable signal recognized as NLC. Thus our model calculations yield PMSE in an altitude range from roughly 81-90 km with the NLC located at the lower edge. This pattern is consistent with the majority of common volume observations of NLC and PMSE.
Lübken Fanz-Josef
Rapp Markus
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