Spectra of turbulence during the dipolarization of the magnetic field

1Kozak, LV, 1Petrenko, BA, 2Kronberg, EA, 3Grigorenko, EE, 4Lui, E, 5Cheremnykh, SO
1Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
2Max Planck Institute, Göttingen, Germany
3Russian Space Research Institute, Moscow, Russia
4Johns Hopkins University, Baltimore, USA
5Space Research Institute under NAS and National Space Agency of Ukraine, Kyiv, Ukraine
Kinemat. fiz. nebesnyh tel (Online) 2018, 34(5):52-69
https://doi.org/10.15407/kfnt2018.05.052
Start Page: Dynamics and Physics of Solar System Bodies
Language: Russian
Abstract: 

The presence of heterogeneity of turbulent processes has been analyzed, and spectra of the turbulence have been obtained for the regions before and during dipolarization of the magnetic field in the Earth's magnetosphere tail from the measurements of four space vehicles of Cluster-2 mission (the event on 21 September 2005). The spectral and wavelet analysis were supplemented by investigations of fluctuation kurtosis for magnetic field absolute value. In the region of dipolarization of magnetic field in the magnetosphere tail we have detected: decreasing horizontal component of magnetic field in parts of the tail and increasing the vertical component; kurtosis change; the presence of powerful Pc5 and Pc4 pulsations, and also direct and inverse cascades; the break in the spectra on frequencies lower than proton gyrofrcqucncy; changing a character of turbulent motions on different time scales (at large time scales, the turbulent flow corresponds to the homogeneous models of Kolmogorov and Iroshnikov-Kraichnan, and at smaller time scales the turbulent flow is described by the clcctron-magnctohydrodynamic turbulence model). Using the measurements from different space vehicles we were able to estimate the velocity of plasma flow in the tail direction.

Keywords: Pc pulsations, substorm development models, tail of the Earth’s magnetosphere, turbulence spectra, turbulent processes
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