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    Complexity Phenomena and ROMA of the Earth’s Magnetospheric Cusp, Hydrodynamic Turbulence, and the Cosmic Web

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    Chang(2015).pdf (3.644Mb)
    Authors
    Chang, T.
    Wu, C.-C.
    Echim, M.
    Lamy, H.
    Vogelsberger, M.
    Hernquist, L.
    Sijacki, D.
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    Discipline
    Earth and related Environmental sciences
    Subject
    cosmic gas
    fluid turbulence
    Fractals
    magnetospheric cusp
    ROMA
    Audience
    Scientific
    Date
    2015
    Metadata
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    Description
    “Dynamic complexity” is a phenomenon observed for a nonlinearly interacting system within which multitudes of different sizes of large scale coherent structures emerge, resulting in a globally nonlinear stochastic behavior vastly different from that which could be surmised from the underlying equations of interaction. A characteristic of such nonlinear, complex phenomena is the appearance of intermittent fluctuating events with the mixing and distribution of correlated structures on all scales. We briefly review here a relatively recent method, ROMA (rank-ordered multifractal analysis), explicitly developed for analysis of the intricate details of the distribution and scaling of such types of intermittent structure. This method is then used for analysis of selected examples related to the dynamic plasmas of the cusp region of the Earth’s magnetosphere, velocity fluctuations of classical hydrodynamic turbulence, and the distribution of the structures of the cosmic gas obtained by use of large-scale, moving mesh simulations. Differences and similarities of the analyzed results among these complex systems will be contrasted and highlighted. The first two examples have direct relevance to the Earth’s environment (i.e., geoscience) and are summaries of previously reported findings. The third example, although involving phenomena with much larger spatiotemporal scales, with its highly compressible turbulent behavior and the unique simulation technique employed in generating the data, provides direct motivation for applying such analysis to studies of similar multifractal processes in extreme environments of near-Earth surroundings. These new results are both exciting and intriguing.
    Citation
    Chang, T.; Wu, C.-C.; Echim, M.; Lamy, H.; Vogelsberger, M.; Hernquist, L.; Sijacki, D. (2015). Complexity Phenomena and ROMA of the Earth’s Magnetospheric Cusp, Hydrodynamic Turbulence, and the Cosmic Web. , Pure and Applied Geophysics, Vol. 172, Issue 7, 2025-2043, DOI: 10.1007/s00024-014-0874-z.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/2765
    doi: http://dx.doi.org/10.1007/s00024-014-0874-z
    scopus: 2-s2.0-84931275099
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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