Low-latitude scintillation weakening during sudden stratospheric warming events

Autor(es)

de Paula, E. R. ^[1] ; Jonah, O. F. ^[1] ; Moraes, A. O. ^[2] ; Kherani, E. A. ^[1] ; Fejer, B. G. ^[3] ; Abdu, M. A. ^[1] ; Muella, M. T. A. H. ^[4] ; Batista, I. S. ^[1] ; Dutra, S. L. G. ^[1] ; Paes, R. R. ^[1]

Afiliação do(s) autor(es)

^[1] Natl Inst Space Res, Sao Paulo - Brazil

^[2] Aeronaut & Space Inst, Sao Paulo - Brazil

^[3] Utah State Univ, Atmospher & Space Sci, Logan, UT 84322 - USA

^[4] Univ Vale do Paraiba, Inst Pesquisa & Desenvolvimento, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS; v. 120, n. 3, p. 2212-2221, MAR 2015.
• Citações Web of Science: 17

Resumo

Global Positioning System (GPS) L1-frequency (1.575GHz) amplitude scintillations at SAo Jose dos Campos (23.1 degrees S, 45.8 degrees W, dip latitude 17.3 degrees S), located under the southern crest of the equatorial ionization anomaly, are analyzed during the Northern Hemisphere winter sudden stratospheric warming (SSW) events of 2001/2002, 2002/2003, and 2012/2013. The events occurred during a period when moderate to strong scintillations are normally observed in the Brazilian longitude sector. The selected SSW events were of moderate and major categories and under low Kp conditions. The most important result of the current study is the long-lasting (many weeks) weakening of scintillation amplitudes at this low-latitude station, compared to their pre-SSW periods. Ionosonde-derived evening vertical plasma drifts and meridional neutral wind effects inferred from total electron content measurements are consistent with the observed weakening of GPS scintillations during these SSW events. This work provides strong evidence of SSW effects on ionospheric scintillations and the potential consequences of such SSW events on Global Navigation Satellite System-based applications. (AU)

• Processo FAPESP: 11/21903-3 - Distúrbios ionosféricos viajantes: simulação e observação, a importância de latitudinal de acoplamento de ondas gravidade-instabilidades Perkins-Es-layer e de forçando desde a pré-sísmica eventos
• Beneficiário: Esfhan Alam Kherani
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores