Alfvén vortices and related phenomena in the ionosphere and the magnetosphere

Chmyrev, V. M.; Bilichenko, S. V.; Pokhotelov, O. A.; Marchenko, V A; Lazarev, V. I.; Streltsov, A. V.; Stenflo, L.

doi:10.1088/0031-8949/38/6/016

Cited by 176 publications

(127 citation statements)

References 52 publications

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“…Their cross-section a is of the order of the ion Larmor radius ρ i and much smaller than the ion-inertial length c/ω pi . The observations of such vortices in the high-latitude ionosphere have been firstly reported by Chmyrev et al (1988). In the same region, solitary kinetic Alfvén waves have been studied by Volwerk et al (1996).…”

Section: Discussionmentioning

confidence: 92%

Solar wind vs magnetosheath turbulence and Alfvén vortices

Alexandrova

2008

Nonlin. Processes Geophys.

112

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Abstract. In this paper we give firstly a broad review of the space plasma turbulence around the ion characteristic space and temporal scales within two natural laboratories, the solar wind and the Earth magnetosheath. In both regions power law spectra of magnetic fluctuations are observed. In both regions these spectra have a break in the vicinity of the ion cyclotron frequency. A distinctive feature of the magnetosheath turbulence is the presence of Alfvén vortices at scales of the spectral break. The Alfvén vortices are multi-scale nonlinear structures. We give a review of the main theoretical features of incompressible Alfvén vortsices in the second part of the paper. Finally, we analyze the spectral properties of the Alfvén vortex solution and of the network of such vortices. We show that the observed magnetosheath spectrum in presence of the Alfvén vortices can be described, at least partially, by the vortex network model.

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Section: Discussionmentioning

confidence: 92%

Solar wind vs magnetosheath turbulence and Alfvén vortices

Alexandrova

2008

Nonlin. Processes Geophys.

112

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“…Finally, the global distribution of electric currents reflects the structure of magnetospheric fields as well as the ionospheric plasma state (inhomogeneity of the transverse ionospheric conductivity, peculiarities in neutral atmosphere motion, etc.) (Chmyrev et al, 1988;Feldstein and Galperin, 1985;Heelis, 1988;Heppner, 1972;Lysak and Carlson, 1981;Lysak and Dum, 1983;Titova et al, 1984). Experimental investigation of these phenomena requires the measurement of currents and electric and magnetic fields in the high latitude ionosphere what is the major goal of the VARIANT mission.…”

Section: Scientific Goals Of Variant Projectmentioning

confidence: 99%

“…(Chmyrev et al, 1988;Heelis, 1988;Lysak and Carlson, 1982;Lysak and Dum, 1983;Titova et al, 1984), still there are many unanswered questions in the problem of ionospheremagnetosphere coupling. Namely, one can mention the following :…”

Section: Introductionmentioning

confidence: 99%

Project VARIANT: Current and field measurements on board SICH-1M satellite

Korepanov¹,

Negoda²,

Lizunov³

et al. 2000

Advances in Space Research

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VARIANT is a joint international space experiment on current density measurements in ionosphericmagnetospheric plasmas. The experiment will be performed onboard the Ukrainian remote sensing satellite SICH-1M, that will be launched in 2000 at the polar circular orbit with the inclination of around 83 ° and altitude 670±30 km. The scientific payload includes three instruments for registration of space current density: a split Langmuir probe, a Rogovski coil and a Faraday cup. The first two of these instruments are dedicated to measure current density variations and the last the particles' fluxes. The equipment also includes sensors for measurements of the electric and magnetic field fluctuations in the frequency range from 0

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“…The following hierarchy of small parameters ( ( 1) is used in the derivation of the reduced two-¯uid MHD model for ultra-low-frequency oscillations given later (Chmyrev et al, 1988;SL2): Here x i is the ion gyrofrequency, v i is the ion thermal speed, v i is the electric drift speed, q i is the ion Larmour radius, and l c and l k are the characteristic scale sizes of the solution in the directions locally perpendicular and parallel to the ambient magnetic ®eld.…”

Section: Reduced Two-¯uid Modelmentioning

confidence: 99%

Influence of the finite ionospheric conductivity on dispersive, nonradiative field line resonances

Streltsov¹,

Lotko²

1997

Ann. Geophys.

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Abstract. The in¯uence of the ®nite ionospheric conductivity on the structure of dispersive, nonradiative ®eld line resonances (FLRs) is investigated for the ®rst four odd harmonics. The results are based on a linear, magnetically incompressible, reduced, two-¯uid MHD model. The model includes e ects of ®nite electron inertia (at low altitude) and ®nite electron pressure (at high altitude). The ionosphere is treated as a highintegrated conducting substrate. The results show that even very low ionospheric conductivity (R 2 mho) is not su cient to prevent the formation of a largeamplitude, small-scale, nonradiative FLR for the third and higher harmonics when the background transverse plasma inhomogeneity is strong enough. At the same time, the fundamental FLR is strongly a ected by a state of low conductivity, and when R 2 mho, this resonance forms only small-amplitude, relatively broad electromagnetic disturbance. The di erence in conductivities of northern and southern ionospheres does not produce signi®cant asymmetry in the distribution of electric and magnetic ®elds along the resonant ®eld line. The transverse gradient of the background AlfveÂ n speed plays an important role in structure of the FLR when the ionospheric conductivity is ®nite. In cases where the transverse inhomogeneity of the plasma is not strong enough, the low ionospheric conductivity can prevent even higher-harmonic FLRs from contracting to small scales where dispersive e ects are important. The application of these results to the formation and temporal evolution of small-scale, active auroral arc forms is discussed.

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Alfvén vortices and related phenomena in the ionosphere and the magnetosphere

Cited by 176 publications

References 52 publications

Solar wind vs magnetosheath turbulence and Alfvén vortices

Solar wind vs magnetosheath turbulence and Alfvén vortices

Project VARIANT: Current and field measurements on board SICH-1M satellite

Influence of the finite ionospheric conductivity on dispersive, nonradiative field line resonances

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