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IJRSP Vol.39(3) [June 2010] >

Title: Scattering of VLF signals from localized perturbations in the lower ionosphere
Authors: Singh, Vikram
Singh, Birbal
Keywords: VLF signals scattering
Transient luminous events (TLEs)
Lower ionosphere perturbations
Reflection coefficient
Issue Date: Jun-2010
Publisher: CSIR
PACS No.: 94.20.Vv
Abstract: A wave-slab interaction model has been used to study the scattering of very low frequency (VLF) ground transmitter signals from localized enhancements of ionization in the lower ionosphere caused by transient luminous events (TLEs) such as sprites. The variation of reflection coefficients has been studied for a fixed frequency VLF transmitter signal of frequency 19.8 kHz (NWC, Australia) monitored at Agra for different slab thicknesses, incident angles, and enhancement factors. The results show that sufficient strength of the reflected signals is obtained for a slab thickness of 3 km, enhancement factor between 2.5 and 3, and incident angle around 750. These results explain satisfactorily the VLF amplitude and phase anomalies in sub-ionospheric VLF transmitter signals recorded at Agra station which are interpreted as caused by transient luminous events.
Page(s): 144-149
ISSN: 0975-105X (Online); 0367-8393 (Print)
Source:IJRSP Vol.39(3) [June 2010]

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