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Stasiewicz, K.; Bellan, Paul M.; Chaston, C. C.; Kletzing, C.; Lysak, R. L.; Maggs, J. E.; Pokhotelov, O. A.; Seyler, C. E.; Shukła, P. K.; Stenflo, L.; Streltsov, A. V.; Wahlund, J. E.

doi:10.1023/a:1005207202143

Cited by 460 publications

(218 citation statements)

References 190 publications

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“…These results suggest that nonlinear IAW framework may be fundamental as suggested by the simulation of curls and folds [Chmyrev et al, 1992]. Physically, the nonlinear mode couplings of the inertial Alfvén fluctuations self-organize into larger-scale structures, which eventually break into smaller size coherent vortex structures [Stasiewicz et al, 2000]. Such a structural evolution into finer scales may be basically expected as shown by Lysak and Song [2008].…”

Section: Discussionmentioning

confidence: 76%

“…These estimates are comparable with those of Asamura et al [2009], and it is likely that IAWs of k y /k z > 20-200 generate by the shear instability. Also, about the time scales for nonlinear IAW interactions, Chmyrev et al [1992] showed that the formation of a fold is within 2 s for the auroral parameters [Stasiewicz et al, 2000].…”

Section: Discussionmentioning

confidence: 99%

“…Physically, the nonlinear mode couplings of the inertial Alfvén fluctuations self-organize into larger-scale structures, which eventually break into smaller size coherent vortex structures [Stasiewicz et al, 2000]. Recently, Chaston and Seki [2010] showed that Kelvin-Helmholtz (KH) and tearing instabilities of a thin current sheet lead to vortices similar to folds and the eventual breakup of the planar arc into distorted fine-scale sheets and filamentary currents.…”

Section: Introductionmentioning

confidence: 99%

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Turbulent microstructures and formation of folds in auroral breakup arc

et al. 2011

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[1] We conducted a ground-based optical measurement pointing at local magnetic zenith with a narrow field of view of 9.3°by 9.3°, using a high-speed electron multiplier charge-coupled device camera at Poker Flat Research Range. We show evidence that auroral folds were periodically formed in a breakup arc and the luminosity is exponentially increased for about 10 s before an auroral breakup onset. The evolution of turbulent microstructures and the formation of folds may be interpreted by the nonlinear evolution of inertial Alfvén wave (IAW) turbulence in the thin current sheet. On the basis of these optical observations, we discuss a possible role of the ionosphere for modulating the triggering process of the onset via the self-organization of the IAW turbulence associated with Kelvin-Helmholtz and tearing instabilities of the thin current sheet.

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Section: Discussionmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Turbulent microstructures and formation of folds in auroral breakup arc

et al. 2011

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“…The concept originates from a development by Lysak and Lotko (1996), and is described in more detail in a review article by Stasiewicz et al (2000). The dispersive properties of DAWs become important when the perpendicular wavelength becomes comparable to the ion gyroradius (ρ i ) or the electron skin depth (λ e ), i.e.…”

Section: Dispersive Alfvén Waves (Daw)mentioning

confidence: 99%

Electromagnetic waves and bursty electron acceleration: implications from Freja

et al. 2002

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Abstract. Dispersive Alfvén wave activity is identified in four dayside auroral oval events measured by the Freja satellite. The events are characterized by ion injection, bursty electron precipitation below about 1 keV, transverse ion heating and broadband extremely low frequency (ELF) emissions below the lower hybrid cutoff frequency (a few kHz). Largescale density depletions/cavities, as determined by the Langmuir probe measurements, and strong electrostatic emissions are often observed simultaneously. A correlation study has been carried out between the E and B field fluctuations below 64 Hz and 10 Hz, respectively, (the DC instruments upper threshold) and the characteristics of the precipitating electrons. This study revealed that the energisation of electrons is indeed related to the broadband ELF emissions and that the electrostatic component plays a predominant role during very active magnetospheric conditions. Furthermore, the effect of the ELF electromagnetic emissions on the larger scale field-aligned current systems has been investigated, and it is found that such an effect cannot be detected. Instead, the Alfvénic activity creates a local region of field-aligned currents. It is suggested that dispersive Alfvén waves set up these local field-aligned current regions and, in turn, trigger more electrostatic emissions during certain conditions. In these regions, ions are transversely heated, and large-scale density depletions/cavities may be created during especially active periods.

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“…A parallel electric field is generated by dispersive Alfvén waves when the parallel electric force is balanced by the electron inertia, electron pressure gradient, and/or the finite ion gyro-radius effect (Stasiewicz et al 2000, and references therein). A dynamic model including the dispersive effects should be considered to properly address science questions associated with the Alfvénic acceleration region .…”

Section: Dispersive Alfvén Wavesmentioning

confidence: 99%

Electromagnetic interaction between Jupiter's ionosphere and the Io plasma torus

2008

Proc. IAU

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Abstract. The electromagnetic interaction between Jupiter and Io has been studied extensively since the discovery of Io-controlled decametric radio emissions (DAMs). A variety of mechanisms for electromagnetic disturbances have been considered including a unipolar inductor, the excitation of large-amplitude Alfvén waves, the generation of electrostatic electric fields parallel to the ambient magnetic field, and etc. Recently, three auroral acceleration regions categorized by terrestrial physicists have been applied to the Jupiter-Io coupling system: the Alfvénic acceleration region is associated with bright emissions at Io's magnetic footprint, whereas the quasi-static system of anti-planetward and planetward currents set up at the inner and outer edges of the torus in the downstream region of Io's wake. This review paper summarizes the current understanding of the coupling mechanisms between Jupiter's ionosphere and the Io plasma torus, as well as the electron acceleration mechanism necessary to excite Io-associated emissions.

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Cited by 460 publications

References 190 publications

Turbulent microstructures and formation of folds in auroral breakup arc

Turbulent microstructures and formation of folds in auroral breakup arc

Electromagnetic waves and bursty electron acceleration: implications from Freja

Electromagnetic interaction between Jupiter's ionosphere and the Io plasma torus

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