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(a) Another type of crossing traced, X-shaped signal with slightly different character recorded on board of DEMETER satellite, ICE VLF burst data (13.10.2004 03:26:40 UT). (b) FFT pattern of theoretically computed signals where one signal part propagated in first guided mode in the Earth-ionosphere waveguide and after this crossed the ionosphere, and the other signal propagated in a direct path from the same lightning to the satellite in oblique direction comparing to the geomagnetic field-lines (courtesy, O.E. Ferencz).
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