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A possible mechanism of the enhancement and maintenance of the shear magnetic field component in the current sheet of the Earth's magnetotail
Malova, H. V.; Zelenyi, L. M.; Malykhin, A. Yu. +1 more
The influence of the shear magnetic field component, which is directed along the electric current in the current sheet (CS) of the Earth's magnetotail and enhanced near the neutral plane of the CS, on the nonadiabatic dynamics of ions interacting with the CS is studied. The results of simulation of the nonadiabatic ion motion in the prescribed mag…
Modeling of different scenarios of thin current sheet equilibria in the Earth's magnetotail
Malova, H. V.; Popov, V. Yu.; Zelenyi, L. M. +1 more
The Earth's magnetosphere is an open dynamic system permanently interacting with the solar wind, i.e., the plasma flow from the Sun. Some plasma processes in the magnetosphere are of spontaneous explosive character, while others develop rather slowly as compared to the characteristic times of plasma particle motion in it. The large-scale current s…
Quasi-adiabatic dynamics of ions in a bifurcated current sheet
Malova, H. V.; Zelenyi, L. M.; Kartsev, Yu. I. +1 more
The study is devoted to ion dynamics in bifurcated current sheets with a two-peak current-density distribution observed in the Earth's magnetotail and solar wind. The ion motion is described by a Hamiltonian system with two degrees of freedom. The presence of a small parameter κ characterizing the ratio between the amplitudes of the normal and tan…
Kinetic models of current sheets with a sheared magnetic field
Malova, H. V.; Popov, V. Yu.; Zelenyi, L. M. +5 more
Thin current sheets, whose existence in the Earth's magnetotail is confirmed by numerous spacecraft measurements, are studied analytically and numerically. The thickness of such sheets is on the order of the ion Larmor radius, and the normal component of the magnetic field (Bz) in the sheet is almost constant, while the tangential (B
Drift modes of a quasi-two-dimensional current sheet
Popov, V. Yu.; Zelenyi, L. M.; Artemyev, A. V. +1 more
Stability of a plasma configuration consisting of a thin one-dimensional current sheet embedded into a two-dimensional background current sheet is studied. Drift modes developing in plasma as unstable waves along the current direction are considered. Dispersion relations for kink and sausage perturbation modes are obtained depending on the ratio o…
Thin current sheets in collisionless plasma: Equilibrium structure, plasma instabilities, and particle acceleration
Malova, H. V.; Popov, V. Yu.; Petrukovich, A. A. +2 more
The review is devoted to plasma structures with an extremely small transverse size, namely, thin current sheets that have been discovered and investigated by spacecraft observations in the Earth's magnetotail in the last few decades. The formation of current sheets is attributed to complicated dynamic processes occurring in a collisionless space p…
Current Sheet in a non-Maxwellian collisionless plasma: Self-consistent theory, simulation, and comparison with spacecraft observations
Popov, V. Yu.; Petrukovich, A. A.; Zelenyi, L. M. +4 more
A self-consistent theory is constructed of anisotropic current equilibria maintained in a non-Maxwellian plasma consisting of cold electrons and two hot ion components of different temperatures. The ion plasma components are described in the quasi-adiabatic approximation, and the plasma electrons, in the MHD approximation. Approximate steady solut…