Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonextensive entropy approach to space plasma fluctuations and
  turbulence   Spatial intermittency in fully developed turbulence is an established feature
of astrophysical plasma fluctuations and in particular apparent in the
interplanetary medium by in situ observations. In this situation the classical
Boltzmann-Gibbs extensive thermo-statistics, applicable when microscopic
interactions and memory are short ranged, fails. Upon generalization of the
entropy function to nonextensivity, accounting for long-range interactions and
thus for correlations in the system, it is demonstrated that the corresponding
probability distributions (PDFs) are members of a family of specific power-law
distributions. In particular, the resulting theoretical bi-kappa functional
reproduces accurately the observed global leptokurtic, non-Gaussian shape of
the increment PDFs of characteristic solar wind variables on all scales.
Gradual decoupling is obtained by enhancing the spatial separation scale
corresponding to increasing kappa-values in case of slow solar wind conditions
where a Gaussian is approached in the limit of large scales. Contrary, the
scaling properties in the high speed solar wind are predominantly governed by
the mean energy or variance of the distribution. The PDFs of solar wind scalar
field differences are computed from WIND and ACE data for different time-lags
and bulk speeds and analyzed within the nonextensive theory. Consequently,
nonlocality in fluctuations, related to both, turbulence and its large scale
driving, should be related to long-range interactions in the context of
nonextensive entropy generalization, providing fundamentally the physical
background of the observed scale dependence of fluctuations in intermittent
space plasmas.

35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga