On the Kelvin-Helmholtz instability of structured plasma layers in the magnetosphere

Uberoi, C.

doi:10.1016/0032-0633(86)90059-0

Cited by 15 publications

(10 citation statements)

References 8 publications

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“… Singer et al [1977] suggested that the K‐H instability amplifies the upstream waves, allowing them to survive the propagation to the ground. Uberoi [1986] suggested that K‐H instabilities can trigger reconnection events under certain conditions.…”

Section: Introductionmentioning

confidence: 99%

Multistation studies of the simultaneous occurrence rate of Pc 3 micropulsations and magnetic impulsive events

et al. 2003

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This study reports simultaneous observations of two different phenomena whose sources may be either near the magnetopause or in the solar wind: Pc 3 micropulsations and high‐latitude magnetic impulsive events (MIEs), whose best studied subset comprises traveling current vortices (TCVs). Isolated Pc 3 emissions that occurred simultaneously with MIE or TCV events and appeared to have the same horizontal speed as the TCVs have been reported. This observation suggests that these events were on the same geomagnetic field lines and may share a common source. The current study reports a search of existing databases for simultaneous Pc 3‐MIE observations. The databases that were searched are the South Pole search coil magnetometer data during 1985–1986 and the Magnetometer Array for Cusp and Cleft Studies (MACCS) database from 1992 to 1993. The rate of occurrence of joint Pc 3 bursts and high‐latitude impulsive events has been consistently found to be ∼70–90%, depending on the database. The rate of coincidence is so high that it suggests that search algorithms based on ground‐based data that seek “clean” MIE signals may be omitting some events owing to the presence of large‐amplitude ULF emissions. A reverse search for candidate MIEs occurring during dayside Pc 3 bursts doubled the number of candidate MIEs in the database. The final results show that 91% of all MIEs were accompanied by Pc 3 emissions, and 43% of all 10–30 min bursts or banded enhancements in Pc 3 emission were accompanied by an MIE. A statistical analysis confirms that the correlation rates are statistically significant. The observed dependence of the properties of the MIE‐concurrent Pc 3s on the solar wind and interplanetary magnetic field is consistent with previous studies of Pc 3s of solar wind origin.

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Section: Introductionmentioning

confidence: 99%

Multistation studies of the simultaneous occurrence rate of Pc 3 micropulsations and magnetic impulsive events

et al. 2003

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“…8 We use a similar model to study the interchange instability of a thin layer with a finite curvature radius. This model allows us to study not only the finite thickness effect on the instability growth rate but also magnetic angle effects.…”

Section: Statement Of Problemmentioning

confidence: 99%

Magnetohydrodynamic instability of a high magnetic shear layer with a finite curvature radius

2002

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This article deals with the magnetohydrodynamic instability of a thin layer which is characterized by a high magnetic shear, a constant curvature radius, and a plasma velocity shear. The magnetic field and the plasma parameters are considered to be piecewise constant inside the layer and in the regions adjacent to the layer. The plasma parameters and the magnetic field are assumed to obey the ideal incompressible magnetohydrodynamics. Fourier analysis is used to calculate small perturbations of the magnetic field and plasma parameters near the layer in linear approximation. The instability growth rate is obtained as a function of different parameters: the magnetic shear angle, the velocity direction angle, the tangential plasma velocity, the layer thickness, the wave number, and the curvature radius. The resulting instability is a mixture of interchange and Kelvin–Helmholtz instabilities on a surface with nonzero curvature. For a fixed velocity shear and curvature radius, the instability growth has a maximum in the case of antiparallel magnetic fields (maximal magnetic shear). This growth rate is an increasing function of the tangential velocity component perpendicular to the magnetic field, and a decreasing function of the velocity component along the magnetic field. The instability is stronger for smaller curvature radius.

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“…Results of research to date have provided a strong observational and theoretical case for existence of a magnetopause K-H instability [2][3][4][5][6][7][8][9][10][11][12]. Recently microstructure of magnetopause was done by analyzing AMPTE/CCE and ISEE2 space craft data [13].…”

Section: Introductionmentioning

confidence: 99%

Gradient Effect on Kelvin Helmholtz Instability in the Presence of Inhomogeneous D.C. Electric Field

Pandey¹

2009

PIER B

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Abstract-Kelvin-Helmoholtz instability by parallel flow velocity shear in presence of inhomogeneous d.c. electric field and perpendicular density temperature magnetic field gradient has been studied by using method of characteristic solution and kinetic approach. Effect of in homogeneity of d.c. electric field and gradient have been discussed in result. The growth rates have been calculated for different effects and showing in stabilizing and destabilizing of instability.

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On the Kelvin-Helmholtz instability of structured plasma layers in the magnetosphere

Cited by 15 publications

References 8 publications

Multistation studies of the simultaneous occurrence rate of Pc 3 micropulsations and magnetic impulsive events

Multistation studies of the simultaneous occurrence rate of Pc 3 micropulsations and magnetic impulsive events

Magnetohydrodynamic instability of a high magnetic shear layer with a finite curvature radius

Gradient Effect on Kelvin Helmholtz Instability in the Presence of Inhomogeneous D.C. Electric Field

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