Generation of electrostatic whistler wave by extraordinary EM wave

Sharma, R. P.; Kumar, Atul; Tripathi, Y. K.; Kumar, Raj

doi:10.1029/98ja02419

Cited by 3 publications

(2 citation statements)

References 32 publications

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“…Cattell et al [2008] have demonstrated that the whistler waves bear quasi-electrostatic character near resonance cone. Sharma et al [1998] studied the generation of electrostatic whistler waves by extraordinary electromagnetic waves near resonance cone angle. As far as resonance cone angle is concerned, it is being very important for electrostatic whistler wave propagation especially in radiation belts.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear effects associated with quasi‐electrostatic whistler waves relevant to that in radiation belts

2017

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A model is proposed to study the dynamics of high‐amplitude quasi‐electrostatic whistler waves propagating near resonance cone angle and their interaction with low‐frequency kinetic Alfvén waves (KAWs) in Earth's radiation belts. The wave dynamics clearly indicates the whistlers having quasi‐electrostatic character when propagating close to resonance cone angle. A high‐amplitude whistler wave packet is obtained using the present analysis which has also been observed by S/WAVES (STEREO/WAVES) instrument onboard STEREO (Solar Terrestrial Relations Observatory). A numerical simulation technique has been employed to study the localization of quasi‐electrostatic whistler waves in radiation belts. The ponderomotive force of pump quasi‐electrostatic whistlers (high frequency) is used to excite low‐frequency waves (KAWs). The turbulent spectrum obtained using the analysis suggests the presence of quasi‐electrostatic whistlers and density fluctuations associated with KAW in radiation belts plasma. The wave localization and steeper spectra could be responsible for particle energization or heating in radiation belts.

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Section: Introductionmentioning

confidence: 99%

Nonlinear effects associated with quasi‐electrostatic whistler waves relevant to that in radiation belts

2017

Self Cite

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“…Mace, 1998;Gary and Cairns, 1999;Zhang et al, 1999b), to the anisotropy of the parallel velocity distribution which appears through heat transfer (Forslund et al, 1972;Gary et al, 1975;Jie Zhao et al, 1996), or to the presence of suprathermal electron fluxes or beams (Kennel and Wong, 1967;Tokar et al, 1984;Ergun et al, 1993;Omelchenko et al, 1994). Whistlers can also be excited by nonlinear wavewave processes; let us cite, for example, the decay of a Langmuir wave into another Langmuir wave with the participation of whistlers and lower hybrid waves, as considered by Kuo and Lee (1989), Leyser (1991), Sawhney et al (1996) and Sharma et al (1998) for ionospheric and laboratory experiment conditions, and only by Abalde et al (1998), Chian and Abalde (1999) and Luo et al (2000) for solar wind plasma conditions.…”

Section: Introductionmentioning

confidence: 99%

Interaction of suprathermal solar wind electron fluxes with sheared whistler waves: fan instability

Krafft

Volokitin

2003

Ann. Geophys.

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Abstract. Several in situ measurements performed in the solar wind evidenced that solar type III radio bursts were sometimes associated with locally excited Langmuir waves, highenergy electron fluxes and low-frequency electrostatic and electromagnetic waves; moreover, in some cases, the simultaneous identification of energetic electron fluxes, Langmuir and whistler waves was performed. This paper shows how whistlers can be excited in the disturbed solar wind through the so-called "fan instability" by interacting with energetic electrons at the anomalous Doppler resonance. This instability process, which is driven by the anisotropy in the energetic electron velocity distribution along the ambient magnetic field, does not require any positive slope in the suprathermal electron tail and thus can account for physical situations where plateaued reduced electron velocity distributions were observed in solar wind plasmas in association with Langmuir and whistler waves. Owing to linear calculations of growth rates, we show that for disturbed solar wind conditions (that is, when suprathermal particle fluxes propagate along the ambient magnetic field), the fan instability can excite VLF waves (whistlers and lower hybrid waves) with characteristics close to those observed in space experiments.

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Quasi-electrostatic Whistler Wave Dynamics in Earth’s Radiation Belt

Kumar

Sharma

Moon

et al. 2017

ApJ

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We present a semi-analytical model to study the dynamics of quasi-electrostatic whistler (hereafter, referred to as QEW) waves in Earth’s outer radian belt. QEW wave is a new mode of whistler waves and comes into existence when a whistler wave propagates obliquely close to the resonance cone angle. The equations for self-driven QEW waves and density perturbation are obtained by a fluid model and solved using a high-performance numerical simulation. The wave localizes and therefore generates filaments/or thin sheets obliquely to the ambient magnetic field by ponderomotive effect, which arises due to a QEW wave. These thin sheets become more complex and intense with time and finally saturate when the modulational instability attains a quasi-steady state. To analyze the turbulence from QEW waves in the radiation belt, we present the electric field power spectrum of QEW waves with frequency. The spectrum can be given by the power law having scaling of the order of f − 2.3 at high frequency, i.e., in the dissipation range. The steeper spectrum at higher frequency may result from the energization of charged particles by energy taken from the fluctuations.

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Generation of electrostatic whistler wave by extraordinary EM wave

Cited by 3 publications

References 32 publications

Nonlinear effects associated with quasi‐electrostatic whistler waves relevant to that in radiation belts

Nonlinear effects associated with quasi‐electrostatic whistler waves relevant to that in radiation belts

Interaction of suprathermal solar wind electron fluxes with sheared whistler waves: fan instability

Quasi-electrostatic Whistler Wave Dynamics in Earth’s Radiation Belt

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