Heidelberg 2015 – wissenschaftliches Programm
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UP: Fachverband Umweltphysik
UP 2: Atmosphäre
UP 2.16: Vortrag
Mittwoch, 25. März 2015, 14:30–14:45, G/gHS
A semi-empirical approach to derive parameters of charged aerosols from EISCAT dual frequency PMSE observations — •Irina Strelnikova1, Martin Friedrich2, Markus Rapp3, Jorge L. Chau1, and Boris Strelnikov1 — 1Leibniz-Institute of Atmospheric Physics, 18225 Kühlungsborn, Germany — 2Graz University of Technology, Graz, Austria — 3German Aerospace Center Institute of Atmospheric Physics, Oberpfaffenhofen, Germany
The existence of ice crystals in the high latitude summer mesopause region is today well established. From optical observations the mean ice mass and the variability of the clouds of these ice crystals can be obtained. Unfortunately "subvisible" ice crystals fractions cannot be observed by optical means. Since these ice crystals are embedded in a plasma, they are involved in the charge balance of the D-region, i.e., they can attach ions and electrons and/or they can lose electrons due to photo detachment and photoemission. Until recently only in-situ observations by rockets have been used for observing the charged components of the plasma. Some attempts have been made to derive size or number density of charged ice crystals from radar observations of polar mesosphere summer echoes (PMSE). In this work we apply recent theories to simultaneously obtain dust size, and number the number densities of dust and electrons from PMSE. These theories are applied to EISCAT VHF and UHF radar observations and are complemented by electron densities from the empirical IMAZ model. The analysis demonstrates that the obtained results are in reasonable quantitative agreement with other observations and theoretical expectations.