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Non‐Gaussian distribution function of AE‐index fluctuations: Evidence for time intermittency
Author(s) -
Consolini Giuseppe,
De Michelis Paola
Publication year - 1998
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1998gl900073
Subject(s) - intermittency , probability density function , statistical physics , gaussian , physics , distribution function , range (aeronautics) , series (stratigraphy) , probability distribution , turbulence , log normal distribution , statistics , mathematics , meteorology , geology , thermodynamics , materials science , paleontology , quantum mechanics , composite material
The probability distribution functions (Pdfs) of the AE‐index fluctuations at different time scales have been investigated using a time series covering a period from January 01, 1978 to December 31, 1985. The Pdfs are always non Gaussian for time scales in the range 1–120 min both in quiet and disturbed periods. The scale dependence of the Pdfs indicates that AE‐index is not characterized by a global time self‐similarity, indicating that an intermittency phenomenon characterizes both phases. The results on Pdfs are compared with functional form, proposed by Castaing et al. [1990], to characterize intermittency phenomena in ordinary turbulent fluid flows. Moreover the relevance of these observations to the understanding of the magnetospheric dynamical configuration is pointed out.