Features of wave excitation of the electrostatic ion cyclotron type in the auroral ionosphere

Чернышов, А. А.; Ilyasov, A. A.; Mogilevsky, M. M.; Golovchanskaya, I. V.; Kozelov, B. V.

doi:10.1134/s0010952516010044

Cited by 8 publications

(7 citation statements)

References 27 publications

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“…26 and 27, and references herein). Numerical stability analysis using FAST or FREJA satellite data was carried out in recent papers, 20,21,[28][29][30] and it was confirmed that the IEDD instability could play an important role in the creation of electrostatic broadband turbulence (or noise) in the auroral zone and explain the experimental observations.…”

Section: Introductionmentioning

confidence: 74%

Studies of small-scale plasma inhomogeneities in the cusp ionosphere using sounding rocket data

et al. 2018

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Microprocesses associated with plasma inhomogeneities are studied on the basis of data from the Investigation of Cusp Irregularities (ICI-3) sounding rocket. The ICI-3 rocket is devoted to investigating a reverse flow event in the cusp F region ionosphere. By numerical stability analysis, it is demonstrated that inhomogeneous-energy-density-driven (IEDD) instability can be a mechanism for the excitation of small-scale plasma inhomogeneities. The Local Intermittency Measure (LIM) method also applied the rocket data to analyze irregular structures of the electric field during rocket flight in the cusp. A qualitative agreement between high values of the growth rates of the IEDD instability and the regions with enhanced LIM is observed. This suggests that IEDD instability is connected to turbulent non-Gaussian processes.

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Section: Introductionmentioning

confidence: 74%

Studies of small-scale plasma inhomogeneities in the cusp ionosphere using sounding rocket data

et al. 2018

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“…Detailed theoretical, laboratory and numerical investigations were performed under various plasma conditions. Recently, data from the satellite FAST were used for numerical analysis of the IEDDI, and there were additional arguments that electrostatic broadband turbulence can be identified as a type of EIC waves excited by the electrostatic ion instability whose development requires localized electric fields of the Alfvén turbulence [Golovchanskaya et al, 2014b[Golovchanskaya et al, , 2014aIlyasov et al, 2015;Chernyshov et al, 2015Chernyshov et al, , 2016. Previously, various authors have considered the waves excited in a homogeneous environment for the interpretation of broadband electrostatic noise; for instance, the ion acoustic or oblique ion acoustic modes (sometimes called the fast ion acoustic mode), the slow ion acoustic mode, the electrostatic ion cyclotron modes, and inertial Alfvén waves.…”

Section: Numerical Stability Analysis Of the Resultsmentioning

confidence: 99%

Reverse flow events and small‐scale effects in the cusp ionosphere

et al. 2016

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We report in situ measurements of plasma irregularities associated with a reverse flow event (RFE) in the cusp F region ionosphere. The Investigation of Cusp Irregularities 3 (ICI‐3) sounding rocket, while flying through a RFE, encountered several regions with density irregularities down to meter scales. We address in detail the region with the most intense small‐scale fluctuations in both the density and in the AC electric field, which were observed on the equatorward edge of a flow shear, and coincided with a double‐humped jet of fast flow. Due to its long‐wavelength and low‐frequency character, the Kelvin‐Helmholtz instability (KHI) alone cannot be the source of the observed irregularities. Using ICI‐3 data as inputs, we perform a numerical stability analysis of the inhomogeneous energy‐density‐driven instability (IEDDI) and demonstrate that it can excite electrostatic ion cyclotron waves in a wide range of wave numbers and frequencies for the electric field configuration observed in that region, which can give rise to the observed small‐scale turbulence. The IEDDI can seed as a secondary process on steepened vortices created by a primary KHI. Such an interplay between macroprocesses and microprocesses could be an important mechanism for ion heating in relation to RFEs.

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“…Here the model parabolic profile of electric field is used. It was shown in the studies [ Ilyasov et al , ; Chernyshov et al , ] that the detailed form of distributions of electric field, as well as of plasma density, is of minor importance for instability generation. Parameters of the background plasma are the following: τ = 0.5, u = 0.1, and ρ i =20 m. As one can see from the plots, unstable solutions are localized at small frequencies.…”

Section: Numerical Aspects and Modeling Resultsmentioning

confidence: 99%

“…Subsequently, it was suggested that this instability leads to formation of the broadband electrostatic turbulence [Gavrishchaka et al, 1996;Kintner et al, 2000]. In the works [Golovchanskaya et al, 2014b;Ilyasov et al, 2015;Chernyshov et al, 2015Chernyshov et al, , 2016, numerical study of the IEDD instability was performed for electrostatic ion cyclotron modes using Freja and FAST satellite data. The results of these studies verified the suggestion that the broadband electrostatic turbulence can be identified with the nonlocal electrostatic ion cyclotron mode.…”

Section: Introductionmentioning

confidence: 99%

Influences of shear in the ion parallel drift velocity and of inhomogeneous perpendicular electric field on generation of oblique ion acoustic waves

et al. 2016

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It is well known that the broadband electrostatic turbulence observed in the topside auroral ionosphere can be identified with electrostatic ion cyclotron and/or oblique ion acoustic waves. Under certain conditions generation of the ion cyclotron modes is inhibited, so that the oblique ion acoustic waves become the prevailing part of the broadband noise. While generation of ion cyclotron waves by the inhomogeneous distribution of energy density (IEDD) instability has been actively studied in recent years, much less attention was paid to the excitation of ion acoustic waves by means of the IEDD instability. In this work, influence of shear in the ion parallel drift velocities and of inhomogeneous perpendicular electric field on generation of nonlocal oblique ion acoustic mode is studied. It is demonstrated that the shear of the ion parallel drift velocities can generate ion acoustic waves. It is shown that this mechanism of instability development provides broadband spectrum in the frequency range around 0.1 of ion gyrofrequency, and thus, this instability can be invoked to explain the observed broadband electrostatic turbulence in the auroral region. Effect of the main background plasma parameters on excitation of oblique ion acoustic waves is analyzed.

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Features of wave excitation of the electrostatic ion cyclotron type in the auroral ionosphere

Cited by 8 publications

References 27 publications

Studies of small-scale plasma inhomogeneities in the cusp ionosphere using sounding rocket data

Studies of small-scale plasma inhomogeneities in the cusp ionosphere using sounding rocket data

Reverse flow events and small‐scale effects in the cusp ionosphere

Influences of shear in the ion parallel drift velocity and of inhomogeneous perpendicular electric field on generation of oblique ion acoustic waves

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