Foo Fighters??? Ball Lightning???

One theory may have had confirmation in 1943, when Allied bombers over Germany started 
spotting strange lights that would approach and track them. No larger than a basketball, 
the lights sometimes appeared to interfere with the aircraft’s electrical system but 
were otherwise harmless. Some have tried to claim that these lights, nicknamed "foo 
fighters", were some form of Nazi secret weapon. 

However, the descriptions of foo fighters match ball lightning very closely. 

The timing is also significant, as they seem to have started appearing when the 
English/Germans deployed radar, and it is quite likely that they were caused by the 
interaction between German systems, or the combination of the German radar and the 
airborne H2S radars carried by allied aircraft. 

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General Electric E821 glass cavity magnetron used in England which worked on 10cm 
(~3GHz) wavelength and became available for aircraft interception. The magnetron 
became the heart of the H2S radar which was installed in British bombers. 

The Freya FuMG 39G was the first German operational early warning radar defense system 
in 1938, along the German border. These sets operated on a 1.8-2.0 meter wave length 
(180-200 cm). For gun laying, a more accurate radar with a more concentrated beam, than 
the Freya was developed by Telefunken. This radar, called the Wuerzburg FuMG 39 operated 
on 50cm (600MHz) wave length. A rotating dipole antenna and a pulsed radar was used. By 
the end of the war, over 5,000 units of this and upgraded models (Wuerzburg D) had been 
in deployed in Europe. The Wuerzburg-D (FuMG 39 T/D) was one of the most advanced radar 
units to be used during WWII.

Inital German airbore radar was the "Lichtenstein B/C" operated on 50cm (600MHz) wave 
length, and fitted on the Luftwaffe's primary night-fighter, the Messerschmitt Me-110 
twin-engine fighter. Then Germany fitted newer radar to their night fighters which were 
also directed to the bomber formations by ground radar. The "Lichtenstein SN2" with a 
band of 2 meters (200cm, ~180MHz) mounted on the Ju-88G night fighters.

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England/Allies used 10cm radar, Germany/Axis used 50cm and 200cm wavelengths.. Aircraft 
resonance from ground radar creating localised standing waves/ionization, static charges 
building up on aircraft and propeller surfaces causing high voltage corona brush discharges,
fuel fumes and carbon exhaust byproducts from engines, metal and paint ions from aircraft 
skin, interference and ionization from onboard airborne radar transmitters causing intense 
energy discharge in very short time periods causing plasma ball formations to occour in 
standing wave areas around aircraft. Plasma ball motion could be due to standing wave 
nodes dynamicly moving around aircraft from flight profile and formation position changes, 
in relation to ground radar and other aircraft...