Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh41b1796c&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH41B-1796
Physics
[2134] Interplanetary Physics / Interplanetary Magnetic Fields, [2149] Interplanetary Physics / Mhd Waves And Turbulence
Scientific paper
The power spectrum of the interplanetary magnetic field (IMF) shows Kolmogrov scaling characteristic of classical fluid turbulence, however the fluctuations in the IMF are only self-similar over a limited range of time scales and the probability distribution functions (PDFs) of the fluctuations have different functional forms at different time scales. The transition from classical turbulence where the IMF time series is self-similar and fractal to multifractal has been extensively studied using PDFs and structure functions. Here, we introduce a method based on the use of cumulative distribution functions (CDFs) to identify self-similar scaling in time series. We apply the CDF method to analyze fluctuations in magnetic energy density for a variety of conditions including distance from the sun, solar activity, and elevation with respect to the ecliptic plane. Generally, the transition from fractal to multifractal is a strong function of both solar activity and elevation.
Banerjee Anindita
Coplan Michael A.
Ogilvie Keith
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