Monday, August 15, 2005

VLF perturbations associated with the 29 July sprites

During the sprite events captured on the 29th of July the parent cloud-to-ground lightning discharges were located close to the GCP-s of the NAA (24.0 kHz), HWU (18.3 kHz) and HWV (20.9 kHz) transmitters to the Crete VLF receiver (see the picture).

Early VLF perturbations have been observed in the amplitude data of the HWU transmitter for 8 sprites (out of the total 10), among which 4 have also been seen in the amplitude and/or phase of the NAA signal. There were no perturbations associated with non sprite-producing CG discharges.


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