Physics – Plasma Physics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3415108h&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 15, CiteID L15108
Physics
Plasma Physics
11
Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: Solar Cycle Variations (7536), Space Plasma Physics: Turbulence (4490), Nonlinear Geophysics: Fractals And Multifractals
Scientific paper
The solar wind exhibits scaling typical of intermittent turbulence in the statistics of in situ fluctuations in both the magnetic and velocity fields. Intriguingly, quantities not directly accessed by theories of ideal, incompressible, MHD turbulence, such as magnetic energy density, B 2, nevertheless show evidence of simple fractal (self-affine) statistical scaling. We apply a novel statistical technique which is a sensitive discriminator of fractality to the B 2 timeseries from WIND and ACE. We show that robust fractal behaviour occurs at solar maximum and determine the scaling exponents. The probability density function (PDF) of fluctuations at solar maximum and minimum are distinct. Power law tails are seen at maximum, and the PDF is reminiscent of a Lévy flight.
Chapman Sandra C.
Hnat Bogdan
Kiyani Khurom
Rowlands George
Watkins Nicholas Wynn
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