Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Multi-spectral optical imaging of the spatiotemporal dynamics of ionospheric intermittent turbulence

Texto completo
Autor(es):
Chian, Abraham C. -L. [1, 2, 3, 4] ; Abalde, Jose R. [2] ; Miranda, Rodrigo A. [5, 6] ; Borotto, Felix A. [7] ; Hysell, David L. [8] ; Rempel, Erico L. [2, 4] ; Ruffolo, David [3]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Univ Adelaide, Sch Math Sci, Adelaide, SA 5005 - Australia
[2] Inst Aeronaut Technol ITA, BR-12228900 Sao Jose Dos Campos, SP - Brazil
[3] Mahidol Univ, Dept Phys, Fac Sci, Bangkok 10400 - Thailand
[4] Natl Inst Space Res INPE, POB 515, BR-12227010 Sao Jose Dos Campos, SP - Brazil
[5] Univ Brasilia UnB, UnB Gama Campus, BR-70910900 Brasilia, DF - Brazil
[6] Univ Brasilia UnB, Inst Phys, Plasma Phys Lab, BR-70910900 Brasilia, DF - Brazil
[7] Univ Concepcion, Fac Ciencias Fis & Matemat, Dept Fis, Concepcion - Chile
[8] Cornell Univ, Dept Earth & Atmospher Sci, Ithaca, NY 14850 - USA
Número total de Afiliações: 8
Tipo de documento: Artigo Científico
Fonte: SCIENTIFIC REPORTS; v. 8, JUL 12 2018.
Citações Web of Science: 0
Resumo

Equatorial plasma depletions have significant impact on radio wave propagation in the upper atmosphere, causing rapid fluctuations in the power of radio signals used in telecommunication and GPS navigation, thus playing a crucial role in space weather impacts. Complex structuring and self-organization of equatorial plasma depletions involving bifurcation, connection, disconnection and reconnection are the signatures of nonlinear evolution of interchange instability and secondary instabilities, responsible for the generation of coherent structures and turbulence in the ionosphere. The aims of this paper are three-fold: (1) to report the first optical imaging of reconnection of equatorial plasma depletions in the South Atlantic Magnetic Anomaly, (2) to investigate the optical imaging of equatorial ionospheric intermittent turbulence, and (3) to compare nonlinear characteristics of optical imaging of equatorial plasma depletions for two different altitudes at same times. We show that the degree of spatiotemporal complexity of ionospheric intermittent turbulence can be quantified by nonlinear studies of optical images, confirming the duality of amplitude-phase synchronization in multiscale interactions. By decomposing the analyses into North-South and East-West directions we show that the degree of non-Gaussianity, intermittency and multifractality is stronger in the North-South direction, confirming the anisotropic nature of the interchange instability. In particular, by using simultaneous observation of multi-spectral all-sky emissions from two different heights we show that the degree of non-Gaussianity and intermittency in the bottomside F-region ionosphere is stronger than the peak F-region ionosphere. Our results are confirmed by two sets of observations on the nights of 28 September 2002 and 9 November 2002. (AU)

Processo FAPESP: 13/26258-4 - Matéria superdensa no universo
Beneficiário:Manuel Máximo Bastos Malheiro de Oliveira
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 09/15769-2 - Propagação de bolhas de plasma ionosférico e ondas na atmosfera superior
Beneficiário:José Ricardo Abalde Guede
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 98/09892-0 - Estudo da propagação de ondas e irregularidades de plasma na ionosfera e desenvolvimento de imageadores "all sky" de alta resolução
Beneficiário:José Ricardo Abalde Guede
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores