Characteristics of solar diurnal variations: A case study based on records from the ground magnetic station at Vassouras, Brazil

Autor(es)

Klausner, V. ^{[1, 2]} ; Papa, A. R. R. ^{[1, 3]} ; Mendes, O. ^[2] ; Domingues, M. O. ^[4] ; Frick, P. ^[5]

Afiliação do(s) autor(es)

^[1] Natl Observ ON, BR-20921400 Rio De Janeiro - Brazil

^[2] INPE CEA DGE Natl Inst Space Res INPE, BR-12227010 Sao Jose Dos Campos, SP - Brazil

^[3] Rio de Janeiro State Univ UERJ, Rio De Janeiro - Brazil

^[4] INPE CTE LAC Natl Inst Space Res INPE, BR-12227010 Sao Jose Dos Campos, SP - Brazil

^[5] Inst Continuous Media Mech, Perm - Russia

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS; v. 92, p. 124-136, JAN 2013.
• Citações Web of Science: 13

Resumo

The horizontal component amplitudes of magnetograms recorded by ground-based observatories of the INTERMAGNET network have been used to analyze the global pattern variance of the solar diurnal variations. Those kinds of data present gaps in records and consequently we explore them via a time-frequency gapped wavelet algorithm. We propose a new approach to analyze magnetograms based on scale correlation. The results show that the magnetic records have a latitudinal dependence affected by the season of year and by the level of solar activity. We have found a disparity on the latitudinal response at Southern and Northern Hemispheres during solstices, which is expected due to the asymmetry of the Sq field. On the other hand at equinoxes, records from stations located at approximately the same latitude but at different longitudes presented peculiar dissimilarities. The achieved results suggest that quiet day patterns and the physical processes involved in their formation are strongly affected by the conductivity of the E-region, the geomagnetic field intensity and its configuration, and the thermospheric winds. (C) 2012 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 07/07723-7 - Análise das características do acoplamento eletrodinâmico plasma solar-magnetosfera com base nos efeitos das correntes elétricas planetárias
• Beneficiário: Odim Mendes Junior
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 11/20588-7 - Estudo das variações geomagnéticas usando técnicas wavelet.
• Beneficiário: Virginia Klausner de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado