Comparison of H component geomagnetic field time series obtained at different sites over South America

Autor(es)

Bolzan, Mauricio J. A. ^[1] ; Denardini, Clezio M. ^[2] ; Tardelli, Alexandre ^[3]

Afiliação do(s) autor(es)

^[1] UFJ, Astron & Space Phys Lab, BR 364, Km 195, 3800, BR-75801615 Jatai, Go - Brazil

^[2] INPE, Estudo & Monitoramento Brasileiro Clima Espacial, Sao Jose Dos Campos, SP - Brazil

^[3] Univ Vale Paraiba UNIVAP, Phys & Astron Lab, Sao Jose Dos Campos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Annales Geophysicae; v. 36, n. 3, p. 937-943, JUN 26 2018.
• Citações Web of Science: 0

Resumo

The geomagnetic field in the Brazilian sector is influenced by the South American Magnetic Anomaly (SAMA) that causes a decrease in the magnitude of the local geomagnetic field when compared to other regions in the world. Thus, the magnetometer network and data set of space weather over Brazil led by Embrace are important tools for promoting the understanding of geomagnetic fields over Brazil. In this sense, in this work we used the H component of geomagnetic fields obtained at different sites in South America in order to compare results from the phase coherence obtained from wavelet transform (WT). Results from comparison between Cachoeira Paulista (CXP) and Eusebio (EUS), and Cachoeira Paulista and Sao Luis (SLZ), indicated that there exist some phenomena that occur simultaneously in both locations, putting them in the same phase coherence. However, there are other phenomena putting both locations in a strong phase difference as observed between CXP and Rio Grande, Argentina (RGA). This study was done for a specific moderate geomagnetic storm that occurred in March 2003. The results are explained in terms of nonlinear interaction between physical phenomena acting in distinct geographic locations and at different times and scales. (AU)

• Processo FAPESP: 12/08445-9 - Estudo da variabilidade dia-a-dia da mesosfera, termosfera e ionosfera em baixas latitudes e região equatorial, durante o ciclo solar 24
• Beneficiário: Paulo Roberto Fagundes
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 15/24791-2 - Estudo de múltiplas estratificações da camada-F em baixas latitudes e região equatorial
• Beneficiário: Alexandre Tardelli
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado