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Title: Branches of electrostatic turbulence inside solitary plasma structures in the auroral ionosphere

Abstract

The excitation of electrostatic turbulence inside space-observed solitary structures is a central topic of this exposition. Three representative solitary structures observed in the topside auroral ionosphere as large-amplitude nonlinear signatures in the electric field and magnetic-field-aligned current on the transverse scales of ∼10{sup 2}–10{sup 3} m are evaluated by the theories of electrostatic wave generation in inhomogeneous background configurations. A quantitative analysis shows that the structures are, in general, effective in destabilizing the inhomogeneous energy-density-driven (IEDD) waves, as well as of the ion acoustic waves modified by a shear in the parallel drift of ions. It is demonstrated that the dominating branch of the electrostatic turbulence is determined by the interplay of various driving sources inside a particular solitary structure. The sources do not generally act in unison, so that their common effect may be inhibiting for excitation of electrostatic waves of a certain type. In the presence of large magnetic-field-aligned current, which is not correlated to the inhomogeneous electric field inside the structure, the ion-acoustic branch becomes dominating. In other cases, the IEDD instability is more central.

Authors:
;  [1]; ;  [2];  [3];  [4]
  1. Polar Geophysical Institute, Apatity 184209 (Russian Federation)
  2. Space research Institute, Moscow 117997 (Russian Federation)
  3. Moscow Institute of Physics and Technology, Moscow 141700 (Russian Federation)
  4. (Russian Federation)
Publication Date:
OSTI Identifier:
22303788
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 8; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLITUDES; CURRENTS; ELECTRIC FIELDS; ENERGY DENSITY; EXCITATION; MAGNETIC FIELDS; NONLINEAR PROBLEMS; PLASMA WAVES; SOUND WAVES; TURBULENCE

Citation Formats

Golovchanskaya, Irina V., Kozelov, Boris V., Chernyshov, Alexander A., Mogilevsky, Mikhail M., Ilyasov, Askar A., and Space research Institute, Moscow 117997. Branches of electrostatic turbulence inside solitary plasma structures in the auroral ionosphere. United States: N. p., 2014. Web. doi:10.1063/1.4891668.
Golovchanskaya, Irina V., Kozelov, Boris V., Chernyshov, Alexander A., Mogilevsky, Mikhail M., Ilyasov, Askar A., & Space research Institute, Moscow 117997. Branches of electrostatic turbulence inside solitary plasma structures in the auroral ionosphere. United States. doi:10.1063/1.4891668.
Golovchanskaya, Irina V., Kozelov, Boris V., Chernyshov, Alexander A., Mogilevsky, Mikhail M., Ilyasov, Askar A., and Space research Institute, Moscow 117997. Fri . "Branches of electrostatic turbulence inside solitary plasma structures in the auroral ionosphere". United States. doi:10.1063/1.4891668.
@article{osti_22303788,
title = {Branches of electrostatic turbulence inside solitary plasma structures in the auroral ionosphere},
author = {Golovchanskaya, Irina V. and Kozelov, Boris V. and Chernyshov, Alexander A. and Mogilevsky, Mikhail M. and Ilyasov, Askar A. and Space research Institute, Moscow 117997},
abstractNote = {The excitation of electrostatic turbulence inside space-observed solitary structures is a central topic of this exposition. Three representative solitary structures observed in the topside auroral ionosphere as large-amplitude nonlinear signatures in the electric field and magnetic-field-aligned current on the transverse scales of ∼10{sup 2}–10{sup 3} m are evaluated by the theories of electrostatic wave generation in inhomogeneous background configurations. A quantitative analysis shows that the structures are, in general, effective in destabilizing the inhomogeneous energy-density-driven (IEDD) waves, as well as of the ion acoustic waves modified by a shear in the parallel drift of ions. It is demonstrated that the dominating branch of the electrostatic turbulence is determined by the interplay of various driving sources inside a particular solitary structure. The sources do not generally act in unison, so that their common effect may be inhibiting for excitation of electrostatic waves of a certain type. In the presence of large magnetic-field-aligned current, which is not correlated to the inhomogeneous electric field inside the structure, the ion-acoustic branch becomes dominating. In other cases, the IEDD instability is more central.},
doi = {10.1063/1.4891668},
journal = {Physics of Plasmas},
number = 8,
volume = 21,
place = {United States},
year = {Fri Aug 15 00:00:00 EDT 2014},
month = {Fri Aug 15 00:00:00 EDT 2014}
}
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  • Inhomogeneities of plasma density and non-uniform electric fields are compared as possible sources of a sort of electrostatic ion cyclotron waves that can be identified with broadband extremely low frequency electrostatic turbulence in the topside auroral ionosphere. Such waves are excited by inhomogeneous energy-density-driven instability. To gain a deeper insight in generation of these waves, computational modeling is performed with various plasma parameters. It is demonstrated that inhomogeneities of plasma density can give rise to this instability even in the absence of electric fields. By using both satellite-observed and model spatial distributions of plasma density and electric field in ourmore » modeling, we show that specific details of the spatial distributions are of minor importance for the wave generation. The solutions of the nonlocal inhomogeneous energy-density-driven dispersion relation are investigated for various ion-to-electron temperature ratios and directions of wave propagation. The relevance of the solutions to the observed spectra of broadband extremely low frequency emissions is shown.« less
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