1. Institut für Physik der Atmosphäre Effect of Drop Oscillations on Polarimetric Radar Parameters Martin Hagen & Miklós Szakáll

2. Institut für Physik der Atmosphäre Measurement of drop shapes by Miklós Szakáll (Uni Mainz) Observations in good agreement with the observations by Beard and Chung

3. Institut für Physik der Atmosphäre Oscillations of rain drops Rain drops oscillate, i.e. axis ratio varies about ± 0.1-0.2 Example: drop 3.5 mm - - -circle 3.5 mm - - - - -equilibrium shape 55 Hz !!

4. Institut für Physik der Atmosphäre Effect of oscillations on radar parameters Distribution of axis ratio during oscillations ? uniform Gaussian harmonic

5. Institut für Physik der Atmosphäre Effect of oscillations on radar parameters (λ 5.45 cm) depends on assumption about distribution of oscillation differences only visible in Mie resonance regime Z HH ZDR KDP Mie resonance regime static: no oscillation