This research is a result of cooperation between the Atmospheric Physics Division of the Institute of Geophysics, University of Warsaw, Poland, and the Institute of Atmospheric Physics, DLR, Oberpfaffenhofen, Germany, under the Polish–German Governmental Agreement on Scientific Cooperation. It was also supported by Grant 6 6314 91 02 of the Polish Committee for Scientific Research.
The authors are indebted to their colleagues from the Institute of Geophysics, University of Warsaw, Poland, and from the Institute of Atmospheric Physics, DLR, Germany, for their assistance and many inspiring discussions, as well as to the aircraft crews. Assistance of Mr. D. Meyr, W. Dietrich, H. Löbel, and H. Horst is particularly acknowledged. Numerical experiments performed by Dr. Wanda Szyrmer from Université du Quebéc a Montreál, Canada, were of great help during development of the instrument. Remarks of Dr. Paul Lawson and anonymous reviewers helped much at improving the final version of the paper.
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