Drift wave instability with loss-cone distribution function—particle aspect analysis

Tiwari, Meenakshi; Varma, P.

doi:10.1016/0032-0633(93)90059-b

Cited by 17 publications

(6 citation statements)

References 18 publications

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“…The relative importance of this approach over fluid and kinetic approachs is also discussed Tiwari, 1992, 1993;Tiwari and Varma, 1993). The main advantages of this approach is to consider the energy transfer between waves and particles, along with the discussion of waves dispersion and growth/damping rate of the waves.…”

Section: Introductionmentioning

confidence: 99%

Beam effect on electromagnetic ion-cyclotron waves with general loss – cone distribution function in an anisotropic plasma-particle aspect analysis

2007

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Abstract. The effect of upgoing ion beam and temperature anisotropy on the dispersion relation, growth rate, parallel and perpendicular resonant energies, and marginal instability of the electromagnetic ion cyclotron (EMIC) waves, with general loss-cone distribution function, in a low β homogeneous plasma, is discussed by investigating the trajectories of the charged particles. The whole plasma is considered to consist of resonant and non-resonant particles. The resonant particles participate in an energy exchange with the waves, whereas the non-resonant particles support the oscillatory motion of the waves. The effects of the steepness of the loss-cone distribution, ion beam velocity, with thermal anisotropy on resonant energy transferred, and the growth rate of the EMIC waves are discussed. It is found that the effect of the upgoing ion beam is to reduce the energy of transversely heated ions, whereas the thermal anisotropy acts as a source of free energy for the EMIC waves and enhances the growth rate. It is found that the EMIC wave emissions occur by extracting energy of perpendicularly heated ions in the presence of an upflowing ion beam and a steep loss-cone distribution function in the anisotropic magnetoplasma. The effect of the steepness of the loss-cone is also to enhance the growth rate of the EMIC waves. The results are interpreted for EMIC emissions in the auroral acceleration region.

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Section: Introductionmentioning

confidence: 99%

Beam effect on electromagnetic ion-cyclotron waves with general loss – cone distribution function in an anisotropic plasma-particle aspect analysis

2007

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“…To evaluate the dispersion relation, growth rate, and growth length, deal with a bi-Maxwellian plasma with density distribution and presume that the particle distribution function is divisible in perpendicular and parallel velocities [11,38,40] i.e. can be represented in the following equation…”

Section: Anisotropic Distribution Functionmentioning

confidence: 99%

“…The loss-cone feature's steepness is gauged by the distribution index J. This is a bi-Maxwellian distribution in the case of J=0 and reduces to the Dirac Delta function at J  [40]. The GLCD function is defined by Summers et al [11].…”

Section: Anisotropic Distribution Functionmentioning

confidence: 99%

Effect of Beam Velocity on Firehose Instability in Earth’s Magneto-plasma with General Loss-Cone Distribution Function

Tandon,

Ahirwar

2023

J. Phys.: Conf. Ser.

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The dynamics of firehose instability (FHI) in the presence of beams is investigated by applying kinetic theory and general loss cone distribution (GLCD) function. It is explained how ion/electron beams affect the growth rate and length of the FHI in low beta homogeneous plasma. The energy of the transversely heated ions is found to be reduced by the ion beam, whereas the temperature anisotropy arranges free energy, to begin with, and accelerates the growth rate of the instability. It has been discovered that the firehose instability results from the extraction of energy from ions heated perpendicularly in the presence of upflowing ion beams in the asymmetrical magneto-plasma. In the auroral acceleration region, the findings are expressed in terms of the firehose instability. The findings may be checked and then may be applied in dusty and multi-component space plasma also.

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“…Also, kinetic Alfvén waves (KAWs) have been investigated in the presence of a general loss-cone distribution, using a particle aspect approach, by Baronia and Tiwari [11], Dwivedi et al [12] and Duan et al [13] for space plasma applications. Drift waves have also been analysed by Tiwari and Varma [14,15] and Varma and Tiwari [16,17] based on a particle aspect approach using general loss-cone distribution functions, and the importance of this distribution function has been emphasized with regards to various applications in laboratory and space plasmas. However, in most of these studies, the analysis was limited to k ⊥ ρ i < 1, where k ⊥ is the perpendicular wave number and ρ i is the ion-gyroradius, and full treatment of perpendicular integrals are less emphasized.…”

Section: Introductionmentioning

confidence: 99%

Effect of the general loss-cone distribution function on kinetic Alfvén waves—a kinetic approach

Shukla¹,

Varma²,

Tiwari³

2007

J. Plasma Phys.

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Kinetic Alfvén waves are investigated in the presence of a general loss-cone distribution function including finite electron pressure and ion-gyroradius effects. The dispersion relation and damping/growth rate are evaluated for different electron to ion temperature ratios, Te/Ti, using a kinetic approach. The wave frequency ω and damping/growth rate γL are evaluated for two regimes of propagation, k⊥ρi < 1 and k⊥ρi > 1, where k⊥ is the perpendicular wave number and ρi is the ion-gyroradius. An enhancement of the wave frequency and a reduction in the damping rate are predicted by steep loss-cone distribution indices and Te/Ti. The growth of the wave is also noticed at higher values of the distribution index and lower Te/Ti. Plasma parameters appropriate to the plasma sheet boundary layer (PSBL) are used to discuss the propagation of kinetic Alfvén waves from the PSBL to the auroral ionosphere.

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Drift wave instability with loss-cone distribution function—particle aspect analysis

Cited by 17 publications

References 18 publications

Beam effect on electromagnetic ion-cyclotron waves with general loss – cone distribution function in an anisotropic plasma-particle aspect analysis

Beam effect on electromagnetic ion-cyclotron waves with general loss – cone distribution function in an anisotropic plasma-particle aspect analysis

Effect of Beam Velocity on Firehose Instability in Earth’s Magneto-plasma with General Loss-Cone Distribution Function

Effect of the general loss-cone distribution function on kinetic Alfvén waves—a kinetic approach

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