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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.)

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

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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]
Total Authors: 7
[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
Total Affiliations: 8
Document type: Journal article
Source: SCIENTIFIC REPORTS; v. 8, JUL 12 2018.
Web of Science Citations: 1

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)

FAPESP's process: 09/15769-2 - Ionospheric plasma bubbles propagations and waves in the upper atmosphere
Grantee:José Ricardo Abalde Guede
Support type: Regular Research Grants
FAPESP's process: 13/26258-4 - Superdense matter in the universe
Grantee:Manuel Máximo Bastos Malheiro de Oliveira
Support type: Research Projects - Thematic Grants