Towards synthesis of solar wind and geomagnetic scaling exponents : A fractional lévy motion model

Mandelbrot introduced the concept of fractals to describe the non-Euclidean shape of many aspects of the natural world. In the time series context, he proposed the use of fractional Brownian motion (fBm) to model non-negligible temporal persistence, the 'Joseph Effect'; and Levy flights to...

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Bibliographic Details
Published in:Space science reviews 2005-11, Vol.121 (1-4), p.271-284
Main Authors: WATKINS, Nicholas W, CREDGINGTON, Daniel, HNAT, Bogdan, CHAPMAN, Sandra C, FREEMAN, Mervyn P, GREENHOUGH, John
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
Fractals
Physics
Studies
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Summary:Mandelbrot introduced the concept of fractals to describe the non-Euclidean shape of many aspects of the natural world. In the time series context, he proposed the use of fractional Brownian motion (fBm) to model non-negligible temporal persistence, the 'Joseph Effect'; and Levy flights to quantify large discontinuities, the 'Noah Effect'. In space physics, both effects are manifested in the intermittency and long-range correlation which are by now well-established features of geomagnetic indices and their solar wind drivers. In order to capture and quantify the Noah and Joseph effects in one compact model, we propose the application of the 'bridging' fractional Levy motion (fLm) to space physics. We perform an initial evaluation of some previous scaling results in this paradigm, and show how fLm can model the previously observed exponents. We suggest some new directions for the future.
ISSN:0038-6308
1572-9672
DOI:10.1007/s11214-006-4578-2