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- Title
Character of turbulence in the boundary regions of the Earth's magnetosphere.
- Authors
Kozak, L.; Savin, S.; Budaev, V.; Pilipenko, V.; Lezhen, L.
- Abstract
The statistical features of the magnetic field and ion flux fluctuations in the boundary regions of the Earth's magnetosphere have been studied on different timescales based on the Interball satellite measurements. Changes in the form and parameters of the probability density function have been studied for the periods when the satellite was in the solar wind plasma, different magnetosheath regions, and the turbulent boundary layer (TBL) at the polar cusp outer boundary. Variations in the probability density function maximum ( P) and the kurtosis value as characteristics of the turbulence property evolution on different timescales have been studied. Two asymptotic regimes of P, which are characterized by different power laws, have been found. The structural functions of different orders and the types of diffusion processes in different regions, depending on time variations in the generalized diffusion coefficient, have been studied in order to analyze the character of diffusion processes. For the magnetosheath regions, TBL, and polar cusp, it has been found that the diffusion coefficient increases in the course of time (i.e., the regime of superdiffusion has been obtained). In the foreshock region before the main shock, turbulent processes are described by the Kolmogorov model of classical diffusion.
- Subjects
MAGNETIC fields; MAGNETOSPHERE; TURBULENCE; KOLMOGOROV complexity; GEOMAGNETISM
- Publication
Geomagnetism & Aeronomy, 2012, Vol 52, Issue 4, p445
- ISSN
0016-7932
- Publication type
Article
- DOI
10.1134/S0016793212040093