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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-133
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-133
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: regular paper 25 Oct 2019

Submitted as: regular paper | 25 Oct 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

Structural characterization of the equatorial F region plasma irregularities in the multifractal context

Neelakshi Joshi1, Reinaldo R. Rosa1, Siomel Savio2,4, Esfhan Alam Kherani2, Francisco Carlos de Meneses3,4, Stephan Stephany1, and Polinaya Muralikrishna2 Neelakshi Joshi et al.
  • 1Computational Space Physics Group, Lab for Computing and Applied Math (LABAC), National Institute for Space Research (INPE), Av. dos Astronautas, 1758, São José dos Campos, São Paulo 12227-690, Brazil
  • 2Aeronomy Division, National Institute for Space Research (INPE), Av. dos Astronautas, 1758, São José dos Campos, São Paulo 12227-690, Brazil
  • 3School of Physics and Mathematics, Autonomous University of Nuevo León (UANL), Av. Universidad s/n, Cd.Universitaria, San Nicolás de los Garza, N.L. 66455, Mexico
  • 4China-Brazil Joint Laboratory for Space Weather, NSSC/INPE, Av. dos Astronautas, 1758, São José dos Campos, São Paulo 12227-690, Brazil

Abstract. In the emerging ionosphere-space-weather paradigm, investigating dynamical properties of ionospheric plasma irregularities using advanced computational non-linear algorithms is providing new insights into their turbulent-like nature, for instance, the evidence of energy distribution via multiplicative cascade. In this study, we present multifractal analysis of the equatorial F region in situ data obtained from two different experiments performed at Alcântara (2.4° S; 44.4° W), Brazil to explore their scaling structures. First experiment observed several large-medium scale plasma bubbles whereas second experiment observed vertical uplift of the base of F region. Multifractal detrended fluctuation analysis and p-model fit is used to analyze the plasma density fluctuation time series. Result shows presence of multifractality with degree of multifractality 0.53–1.1 with 0.29 ≤ p ≤ 0.4 cascading probability for first experiment. Another experimental data also exhibits multifractality with degree of multifractality 0.27–0.33 with 0.42 ≤ p ≤ 0.44 cascading probability in the ionospheric plasma irregularities. Our results confirm the nonhomogeneous nature of plasma irregularities and characterize the underlying nonhomogeneous multiplicative cascade hypothesis in the ionospheric medium. Differences in terms of scaling and complexity in data belonging to different types of phenomena are also addressed.

Neelakshi Joshi et al.
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Neelakshi Joshi et al.
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