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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.)

An alternative way to identify local geomagnetically quiet days: a case study using wavelet analysis

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Author(s):
Klausner, Virginia [1, 2, 3] ; Rodriguez Papa, Andres Reinaldo [2, 4] ; Nicole Candido, Claudia Maria [1] ; Domingues, Margarete Oliveira [1] ; Mendes, Odim [1]
Total Authors: 5
Affiliation:
[1] Natl Inst Space Res INPE, BR-12227010 Sao Jose Dos Campos, SP - Brazil
[2] Natl Observ, BR-20921400 Rio De Janeiro, RJ - Brazil
[3] Vale do Paraiba Univ UNIVAP, BR-12244000 Sao Jose Dos Campos, SP - Brazil
[4] Rio de Janeiro State Univ UERJ, BR-20550900 Rio De Janeiro, RJ - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Annales Geophysicae; v. 34, n. 4, p. 451-462, 2016.
Web of Science Citations: 3
Abstract

This paper proposes a new method to evaluate geomagnetic activity based on wavelet analysis during the solar minimum activity (2007). In order to accomplish this task, a newly developed algorithm called effectiveness wavelet coefficient (EWC) was applied. Furthermore, a comparison between the 5 geomagnetically quiet days determined by the Kp-based method and by wavelet-based method was performed. This paper provides a new insight since the geomagnetic activity indexes are mostly designed to quantify the extent of disturbance rather than the quietness. The results suggest that the EWC can be used as an alternative tool to accurately detect quiet days, and consequently, it can also be used as an alternative to determine the Sq baseline to the current Kp-based 5 quietest days method. Another important aspect of this paper is that most of the quietest local wavelet candidate days occurred in an interval 2 days prior to the high-speed-stream-driven storm events. In other words, the EWC algorithm may potentially be used to detect the quietest magnetic activity that tends to occur just before the arrival of high-speed-stream-driven storms. (AU)

FAPESP's process: 13/06029-0 - Wavelet techniques applied to study of space electrodynamic phenomena
Grantee:Virginia Klausner de Oliveira
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 11/20588-7 - STUDY ON THE GEOMAGNETIC VARIATIONS USING WAVELET TECHNIQUES.
Grantee:Virginia Klausner de Oliveira
Support Opportunities: Scholarships in Brazil - Post-Doctoral