Investigation of the effect of intermittency of the turbulent field on particle acceleration in the plasma sheet of the Earth's magnetotail

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Abstract

Using a numerical model, the influence of intermittency on the acceleration of particles in the equatorial plane of the Earth's magnetotail was studied. For comparison with observational data, we selected the event of July 17, 2001, when plasma flows with velocities of up to 400 km/s and an amplitude of the turbulent magnetic field of the order of ten nT were observed in the plasma layer of the magnetotail for more than 10 minutes. Modeling of the electromagnetic field is carried out using a superposition of wavelets, which are distributed uniformly throughout the computational domain. By means of a special distribution of amplitudes, we ensure that the resulting field is multifractal and intermittent. It is shown that when accelerated in an intermittent field, the energy spectra of particles rise and flatten, which means that particles are able to gain more energy than when accelerated in a turbulent plasma layer without taking into account intermittency.

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About the authors

N. N. Levashov

Space Research Institute

Author for correspondence.
Email: nn.levashov@physics.msu.ru
Russian Federation, Moscow

V. Yu. Popov

Space Research Institute; Lomonosov Moscow State University; HSE University

Email: nn.levashov@physics.msu.ru

Lomonosov Moscow State University, Physical Faculty

Russian Federation, Moscow; Moscow; Moscow

H. V. Malova

Space Research Institute; Lomonosov Moscow State University

Email: nn.levashov@physics.msu.ru

Scobeltsyn Institute of Nuclear Physics of the Lomonosov Moscow State University

Russian Federation, Moscow; Moscow

L. M. Zelenyi

Space Research Institute

Email: nn.levashov@physics.msu.ru
Russian Federation, Moscow

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Supplementary files

Supplementary Files
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2. Fig. 1. Magnetic field fluctuations during the substorm of 17.VII.2001

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3. Fig. 2. Distribution of weighting coefficients by cells

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4. Fig. 3. Multifractal spectrum function

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5. Fig. 4. Component Bz of the simulated field along the X axis for intermittent and non-intermittent cases

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6. Fig. 5. Dependence of structural function indicators on the degree

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7. Fig. 6. Energy distribution of protons (a), alpha particles (b) and oxygen ions (c) after 500 s of acceleration in a turbulent field. The black solid lines show the initial energy distributions. The blue dashed and red dotted lines indicate, respectively, non-intermittent and intermittent turbulence.

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