Advanced Time–Frequency Characterization of VLF Transients Using Continuous Wavelet Transform

Author(s)	Ashutosh Kumar, Amrendra Kumar, Deepak Kumar Sondhiya
Country	India
Abstract	Continuous Wavelet Transform (CWT) has emerged as a powerful tool for analyzing nonlinear and non‑stationary electromagnetic signals. In this study, Very Low Frequency (VLF) transient signals recorded by the DEMETER satellite are analyzed using Morlet wavelet–based multiresolution analysis. The proposed approach provides superior time–frequency localization compared to conventional Fourier methods and enables detailed visualization of transient structures. The scalogram representation reveals resonance characteristics, harmonic components, and temporal energy distribution associated with ionospheric wave–particle interaction processes
Keywords	VLF Signals, Continuous Wavelet Transform and Spectral analysis
Field	Engineering
Published In	Volume 8, Issue 1, January-February 2026
Published On	2026-01-03

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