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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A wavelet based method to remove the long term periodicities of geophysical time series

Full text
Author(s):
Bolzan, M. J. A. [1] ; Franco, A. M. S. [2, 3] ; Echer, E. [2, 3]
Total Authors: 3
Affiliation:
[1] Fed Univ Jatai, Astron & Space Phys Lab LAFEJ, UFJ BR 360, Jatai, Go - Brazil
[2] INPE, Natl Inst Space Res, Space Geophys Dept, Av Astronautas 2911, Sao Jose Dos Campos, SP, Brazil.Bolzan, M. J. A., Fed Univ Jatai, Astron & Space Phys Lab LAFEJ, UFJ BR 360, Jatai, Go - Brazil
[3] INPE, Natl Inst Space Res, Space Geophys Dept, Av Astronautas 2911, Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Advances in Space Research; v. 66, n. 2, p. 299-306, JUL 15 2020.
Web of Science Citations: 0
Abstract

In this work it is shown how to remove the long-term periodicities present in geophysical time series using the Daubechies (db4) wavelet functions. This methodology consists in extraction of part of the energy from large scales (long periods) determined through of a threshold chosen from the variance analysis performed by scale. The Morlet wavelet transform was used in order to show that this procedure removes the energy from long-term periodicities while preserving all original frequencies. This method is applied to a case study of magnetotail response to interplanetary magnetic field (IMF) Bz fluctuations during a high-intensity long-duration continuous AE activity (HILDCAA) event. (C) 2020 COSPAR. Published by Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 17/00516-8 - A study on electron oscillations in the magnetosheath of mars with mars express observations
Grantee:Adriane Marques de Souza Franco
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 18/21657-1 - Study of Jupiter magnetospheric auroral radio activity variability
Grantee:Ezequiel Echer
Support Opportunities: Regular Research Grants
FAPESP's process: 16/10794-2 - Study on Electron Oscilations in the Magnetosheath of Mars
Grantee:Adriane Marques de Souza Franco
Support Opportunities: Scholarships in Brazil - Doctorate