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15 results on '"Echim, Marius M."'

2. Turbulence-generated proton-scale structures in the terrestrial magnetosheath

Author

Vörös, Zoltán, Yordanova, Emiliya, Echim, Marius M., Consolini, Giuseppe, and Narita, Yasuhito

Subjects
Physics - Plasma Physics
Abstract

Recent results of numerical magnetohydrodynamic simulations suggest that in collisionless space plasmas turbulence can spontaneously generate thin current sheets. These coherent structures can partially explain intermittency and the non-homogenous distribution of localized plasma heating in turbulence. In this Letter Cluster multi-point observations are used to investigate the distribution of magnetic field discontinuities and the associated small-scale current sheets in the terrestrial magnetosheath downstream of a quasi-parallel bow shock. It is shown experimentally, for the first time, that the strongest turbulence generated current sheets occupy the long tails of probability distribution functions (PDFs) associated with extremal values of magnetic field partial derivatives. During the analyzed one hour long time interval, about a hundred strong discontinuities, possibly proton-scale current sheets were observed., Comment: 10 pages, 5 figures in The Astrophysical Journal Letters, Volume 819, Number 1, 2016

Published
2016
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9. Quiescent Discrete Auroral Arcs: A Review of Magnetospheric Generator Mechanisms.

Author

Borovsky, Joseph E., Birn, Joachim, Echim, Marius M., Fujita, Shigeru, Lysak, Robert L., Knudsen, David J., Marghitu, Octav, Otto, Antonius, Watanabe, Tomo-Hiko, and Tanaka, Takashi

Subjects
ELECTRON plasma, MAGNETOSPHERE, BOUNDARY layer (Aerodynamics), SPACE sciences, IONOSPHERE
Abstract

One of the longstanding questions of space science is: How does the Earth's magnetosphere generate auroral arcs? A related question is: What form of energy is extracted from the magnetosphere to drive auroral arcs? Not knowing the answers to these questions hinders our ability to determine the impact of auroral arcs on the magnetospheric system. Magnetospheric mechanisms for driving quiescent auroral arcs are reviewed. Two types of quiescent arcs are (1) low-latitude non-Alfvénic (growth-phase) arcs magnetically connecting to the electron plasma sheet and (2) high-latitude arcs magnetically connecting near the plasma-sheet boundary layer. The reviews of the magnetospheric generator mechanisms are separated for the two types of quiescent arcs. The driving of auroral-arc currents in large-scale computer simulations is examined. Predicted observables in the magnetosphere and in the ionosphere are compiled for the various generator mechanisms. [ABSTRACT FROM AUTHOR]

Published
2020
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