Search Publications
Role of Oxygen Ions in the Structure of the Current Sheet of the Near-Earth Magnetotail
Zelenyi, L. M.; Malova, Kh. V.; Mingalev, I. V. +5 more
A numerical model is used to study the possibility of a thin current sheet formation in the near-Earth magnetotail in the growth phase of a substorm for a wide range of parameters of longitudinal countermoving ion flows that create current sheet. The simulation results make it possible to conclude that the current sheet can be formed by oxygen ion…
Albert Galeev: The Problem of Metastability and Explosive Reconnection
Popov, V. Yu.; Zelenyi, L. M.; Grigorenko, E. E. +2 more
−Albert Abubakirovich Galeev is a Soviet and Russian expert in plasma physics who actively contributed to fusion research. In the early 1970s, he became a head of department at the Space Research Institute of the Academy of Sciences of USSR and began devoting most of his time to the problems of the physics of space plasma and made a very important…
Solar Electrons and Protons in the Events of September 4-10, 2017 and Related Phenomena
Logachev, Yu. I.; Struminskii, A. B.; Grigor'eva, I. Yu. +1 more
The solar proton events on September 4-10, 2017 motivated us to reconsider the hypothesis of the presence of two phases of acceleration of charged particles in solar flares in which nonrelativistic electrons are accelerated in the first phase, while relativistic electrons and protons are accelerated during the second phase. According to the data o…
Evolution of the Solar Wind Speed with Heliocentric Distance and Solar Cycle. Surprises from Ulysses and Unexpectedness from Observations of the Solar Corona
Malova, H. V.; Zelenyi, L. M.; Bemporad, A. +5 more
An extensive analysis of Ulysses observations of the solar wind speed V from 1990 to 2008 is undertaken. It is shown that the evolution of V with heliocentric distance r depends substantially on both the heliolatitude and the solar activity cycle. Deviations from the predicted Parker's profile of V(r) are so considerable that cannot be explained b…
Hall Effect in Laboratory and Space Current Sheets
Petrukovich, A. A.; Nakamura, R.; Artemyev, A. V. +2 more
The role of the Hall effect in the formation of thin current sheets (CSs) is analyzed by comparing results of laboratory and satellite experiments. In spite of the strong difference in the plasma parameters, both laboratory and space CSs are characterized by the hot ion component and cold isotropic electron component. Such a relation between the i…
3D Magnetic Holes in Collisionless Plasmas
Artemyev, A.; Vasko, I.; Yushkov, E. +1 more
Recent multispacecraft observations in the Earth's magnetosphere have revealed an abundance of magnetic holes—localized magnetic field depressions. These magnetic holes are characterized by the plasma pressure enhancement and strongly localized currents flowing around the hole boundaries. There are several numerical and analytical models describin…
Time Evolution of the Macroscopic Characteristics of a Thin Current Sheet in the Course of Its Formation in the Earth's Magnetotail
Malova, H. V.; Popov, V. Yu.; Domrin, V. I.
A numerical model is developed that allows tracing the time evolution of a current sheet from a relatively thick current configuration with isotropic distributions of the pressure and temperature in an extremely thin current sheet, which plays a key role in geomagnetic processes. Such a configuration is observed in the Earth's magnetotail in the s…
Adiabatic Heating of Electrons in the Magnetospheric Current Sheet
Petrukovich, A. A.; Artemyev, A. V.; Lukin, A. S. +1 more
Electron dynamics and acceleration in an electromagnetic field configuration modeling the current sheet configuration of the Earth's magnetotail region is investigated. A focus is made on the role of the dawn‑dusk magnetic field component By in the convection electron heating by an electric field Ey. For numerical integration…
Generation of auroral kilometric radiation by a finite-size source in a dipole magnetic field
Burinskaya, T. M.; Shevelev, M. M.
Generation, amplification, and propagation of auroral kilometric radiation in a narrow three-dimensional plasma cavity in which a weakly relativistic electron beam propagates is studied in the geometrical optics approximation. It is shown that the waves that start with a group velocity directed earthward and have optimal relation between the wave …
Formation of a quasi-one-dimensional current sheet in the laboratory experiment and in the Earth's magnetotail
Petrukovich, A. A.; Artemyev, A. V.; Vasko, I. Y. +2 more
Two-dimensional current sheets (CSs) generated in the CS-3D laboratory device are considered. Results obtained in the laboratory experiment are compared with spacecraft observations of CSs in the Earth's magnetotail. The longitudinal and transverse CS structures, as well as CS evolution during the thinning process are studied. It is demonstrated t…