Small‐scale, dispersive field line resonances in the hot magnetospheric plasma

Streltsov, A. V.; Lotko, W.; Johnson, Jay R.; Cheng, C. Z.

doi:10.1029/98ja02679

Cited by 81 publications

(109 citation statements)

References 48 publications

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“…Previous two-fluid models [e.g., Streltsov et al, 1998] have included the electron thermal effect; however, such models do not include the effect of Landau damping, which can be just as significant. Landau damping is included in particle-in-cell or Vlasov models [e.g., Génot et al, 1999Génot et al, , 2000Génot et al, , 2001Watt and Rankin, 2007, but such models are limited in spatial extend and/or dimensionality and so cannot model the full threedimensional region.…”

Section: Kinetic Alfvén Waves In the Warm Plasma Regionmentioning

confidence: 99%

Development of parallel electric fields at the plasma sheet boundary layer

Lysak

Song

2011

J. Geophys. Res.

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[1] Many measurements of auroral particles, in particular recent measurements from the FAST satellite, indicate that the auroral electron distribution is often broad in energy and field-aligned in pitch angle. Such electrons are seen in conjunction with strong kinetic Alfvén waves with small perpendicular wavelength, and so the aurora produced by these electrons has been termed the "Alfvénic aurora." The Alfvénic aurora is predominant at the polar cap boundary of the aurora as well as in the auroral arc that brightens during substorm onset. The process of forming parallel electric fields in Alfvén waves has been investigated by means of three-dimensional two-fluid simulations. Waves with small perpendicular wavelengths can be produced by phase mixing when perpendicular gradients are present in the plasma. At lower altitudes, Alfvén waves can interact with the ionospheric Alfvén resonator and phase mix to scales of a few kilometers. At higher altitudes, the electron thermal speed becomes comparable or larger than the Alfvén speed, and parallel electric fields due to the Landau resonance can develop. This has been modeled in the fluid code by an approximation to the plasma dispersion function used in kinetic theory. Phase mixing is most effective when there are strong gradients, such as at the plasma sheet boundary layer. Simulations indicate that these processes can produce parallel electric fields on scales of a few kilometers (in the cold plasma case) to a few tens of kilometers (in the warm plasma case), comparable to the scale sizes of auroral arcs.

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Section: Kinetic Alfvén Waves In the Warm Plasma Regionmentioning

confidence: 99%

Development of parallel electric fields at the plasma sheet boundary layer

Lysak

Song

2011

J. Geophys. Res.

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“…Streltsov and Lotko, 1998) the electron parallel momentum equation m e n 0 ∂v e ∂t + ν e v e + en 0 E +b · ∇p e = 0 (3) the plasma density continuity equation…”

Section: Mhd Model Of the Magnetospherementioning

confidence: 99%

Simulations of resonant Alfvén waves generated by artificial HF heating of the auroral ionosphere

Pokhotelov

Lotko²,

Streltsov³

2004

Ann. Geophys.

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Abstract. Numerical two-dimensional two-fluid MHD simulations of dynamic magnetosphere-ionosphere (MI) coupling have been performed to model the effects imposed on the auroral ionosphere by a powerful HF radio wave transmitter. The simulations demonstrate that modifications of the ionospheric plasma temperature and recombination due to artificial heating may trigger the ionospheric feedback instability when the coupled MI system is close to the state of marginal stability. The linear dispersion analysis of MI coupling has been performed to find the favorable conditions for marginal stability of the system. The development of the ionospheric feedback instability leads to the generation of shear Alfvén waves which resonate in the magnetosphere between the heated ionospheric E-region and the strong gradient in the Alfvén speed at altitudes of 1-2 R E . The application of the numerical results for the explanation of observations performed by low-orbiting satellites above the highlatitude ionosphere heated with a high power ground-based HF transmitter is discussed.

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“…This change in sign has been invoked by Streltsov et al [10,11] to explain trapping of dispersive Alfvén waves on auroral magnetic field lines between the ionospheres. Subtle evidence for electron acceleration [12] and wave refraction [13] have been observed in laboratory parallel e gradients.…”

mentioning

confidence: 95%

“…. Streltsov et al [11] have predicted that for dispersive shear waves, v g? should go to zero at e 2 (assuming T i 0).…”

Section: Volume 93 Number 10 P H Y S I C a L R E V I E W L E T T E Rmentioning

confidence: 99%

Shear Alfvén Wave Perpendicular Propagation from the Kinetic to the Inertial Regime

2004

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Small‐scale, dispersive field line resonances in the hot magnetospheric plasma

Abstract: Abstract.The formation, temporal behavior, and spatiM structure of field line resonance (

Cited by 81 publications

References 48 publications

Development of parallel electric fields at the plasma sheet boundary layer

Development of parallel electric fields at the plasma sheet boundary layer

Simulations of resonant Alfvén waves generated by artificial HF heating of the auroral ionosphere

Shear Alfvén Wave Perpendicular Propagation from the Kinetic to the Inertial Regime

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