Comments by Andreas Dörnbrack and Hans Volkert on an earlier version of the manuscript helped improving the presentation of the material. Three anonymous reviewers provided further constructive suggestions. This work is part of the author’s doctoral thesis at the University of Munich. The Institut für Physik der Atmosphäre, Deutsches Zentrum für Luft- und Raumfahrt, Oberpfaffenhofen, Germany, provided the funding and a favorable research environment.
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