Time-frequency decomposition of signals in a current disruption event

A. T.Y. Lui, Amir Najmi

Research output: Contribution to journalArticle

Abstract

Wavelet transform has recently been developed to the level of sophistication suitable for application to signal processing in magnetospheric research. We explore this new technique in decomposing signals in the time-frequency domain by first conducting continuous wavelet transform on a test signal to show its ability to resolve multiple-frequency components embedded within white noise of half the amplitude as the signal. We then use this tool to examine the large-amplitude magnetic fluctuations observed during a current disruption event. The results show the current disruption to be a multiscale phenomenon, encompassing low- as well as high-frequency components. The lowest-frequency component appears to behave quite independently from the higher-frequency components. The analysis shows for the first time that in current disruption the high-frequency components constitute a broadband excitation with a nonstationary nature, i.e., some oscillations appear to cascade from high to low frequency as time progresses.

Original languageEnglish (US)
Article number97GL03229
Pages (from-to)3157-3160
Number of pages4
JournalGeophysical Research Letters
Volume24
Issue number24
DOIs
StatePublished - Jan 1 1997

Fingerprint

decomposition
wavelet
transform
low frequencies
white noise
wavelet analysis
signal processing
oscillation
cascades
broadband
conduction
oscillations
excitation
analysis
test

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Time-frequency decomposition of signals in a current disruption event. / Lui, A. T.Y.; Najmi, Amir.

In: Geophysical Research Letters, Vol. 24, No. 24, 97GL03229, 01.01.1997, p. 3157-3160.

Research output: Contribution to journalArticle

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