Yahoo! The German government agrees with me that the phenomenon was too massive to be caused by a few planes:
http://donnerwetter.de/news/news.mv?id=6718(My and Google’s translation�)
Answer of the federal state government Ministry for the interior (and sport) of Lower Saxony Hannover - 53.01-30309-02, 24.05.2006
I hereby answer the small inquiry of the Green member of parliament as follows on behalf of the federal state government: According to the available information, neither in the Ministry for the interior and sport nor in other departments involved (ms, ML, MU) is there any knowledge relevant to the answer of the questions addressed to the federal state government. For this reason, in order to clarify the topic, an appropriate request for information on the questions posed was addressed to the Federal Ministry of defence (BMVg) . The Parliamentary and cabinet representative of the BMVg answered the questions in a letter of 28.04.2006 as follows:
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Concerning 1 (what knowledge did you have of the reported phenomena over North Germany?): The Federal Ministry of defence (BMVg) does not have any knowledge of the reported phenomena. No recordings of the period in July 2005 applicable to the phenomenon are at the disposal of the BMVg due to the time limit on archiving of the data and also due to the sensor technology used. At the time in question in the region concerned, no national Air Force exercises, tactical tests or similar aeronautical activities were carried out.
After an investigation of radar recordings of the Air Force it was stated that at the end of March 2006 in Netherlands air space an aerial engagement exercise took place on the night of the 22nd to the 23rd of March 2006 approx. 1 hour before occurrence of the phenomenon. The recordings prove that thereby very small quantities of chaff were released, which however, as can be proven, had dissipated again after approximately 1 hour and 10 minutes.
Concerning 2 (How were these interpreted and explained?): The possibility of causing such a phenomenon of the described order of magnitude by active electromagnetic radiation can in principle be excluded due to the following physical considerations: Only the release of very special chaff in substantial quantities (in the range of many tons) could generate such a phenomenon. In the framework of the aerial engagement exercises, however, only a tiny fraction of this quantity is discharged by the self defence systems of aircraft of the German Federal Armed Forces as well as of allied armed forces. The Air Force has no electronic interference or deception procedures, which could cause a phenomenon of this dimension while at the same time confining a closely limited effect to a specific sensor. On the basis of the information available here, aerial systems of the German Federal Armed Forces are out of the question as possible perpetrators of the cloud phenomena.
Concerning 3 (Does the federal state government concur with the estimate of Meteorologists, Geologists and Physicists that the inexplicable weather phenomena and/or radar recordings must be due to military experiments, since otherwise no serious explanation for it is to be found? ): The German Federal Armed Forces do not perform experiments, which could cause such a phenomenon.
Concerning 4 (Does the federal state government have knowledge of appropriate military exercises over Northern Germany with the goal of defence from terrorists or influencing the weather?): The German Federal Armed Forces do not perform military exercises with the goal of defence from terrorists or for influencing the weather.
To 5 to 7 (5. Is it to be feared that health or other dangers for humans and nature might result from these attempts? 6. Which Federal authority is and/or would be responsible for the notification of such military exercises? 7. According to which relevant standards are such experiments permitted?): See answers to 3 and 4.