Fig. 6.
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(a) One type of crossing traced, X-shaped whistler or whistler-like signal branch recorded on board of DEMETER satellite, ICE VLF burst data (20.09.2004 21:03:20 UT). (b) Theoretical UWB propagating model in which the propagating modes are guided in a duct and in the FFT pattern are crossing each other (courtesy, O.E. Ferencz).
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